501 lines
16 KiB
Go
501 lines
16 KiB
Go
package configs
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/gohcl"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/convert"
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"github.com/hashicorp/terraform/internal/addrs"
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"github.com/hashicorp/terraform/internal/typeexpr"
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)
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// A consistent detail message for all "not a valid identifier" diagnostics.
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const badIdentifierDetail = "A name must start with a letter or underscore and may contain only letters, digits, underscores, and dashes."
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// Variable represents a "variable" block in a module or file.
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type Variable struct {
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Name string
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Description string
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Default cty.Value
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// Type is the concrete type of the variable value.
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Type cty.Type
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// ConstraintType is used for decoding and type conversions, and may
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// contain nested ObjectWithOptionalAttr types.
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ConstraintType cty.Type
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ParsingMode VariableParsingMode
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Validations []*CheckRule
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Sensitive bool
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DescriptionSet bool
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SensitiveSet bool
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// Nullable indicates that null is a valid value for this variable. Setting
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// Nullable to false means that the module can expect this variable to
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// never be null.
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Nullable bool
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NullableSet bool
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DeclRange hcl.Range
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}
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func decodeVariableBlock(block *hcl.Block, override bool) (*Variable, hcl.Diagnostics) {
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v := &Variable{
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Name: block.Labels[0],
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DeclRange: block.DefRange,
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}
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// Unless we're building an override, we'll set some defaults
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// which we might override with attributes below. We leave these
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// as zero-value in the override case so we can recognize whether
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// or not they are set when we merge.
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if !override {
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v.Type = cty.DynamicPseudoType
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v.ConstraintType = cty.DynamicPseudoType
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v.ParsingMode = VariableParseLiteral
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}
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content, diags := block.Body.Content(variableBlockSchema)
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if !hclsyntax.ValidIdentifier(v.Name) {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid variable name",
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Detail: badIdentifierDetail,
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Subject: &block.LabelRanges[0],
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})
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}
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// Don't allow declaration of variables that would conflict with the
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// reserved attribute and block type names in a "module" block, since
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// these won't be usable for child modules.
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for _, attr := range moduleBlockSchema.Attributes {
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if attr.Name == v.Name {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid variable name",
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Detail: fmt.Sprintf("The variable name %q is reserved due to its special meaning inside module blocks.", attr.Name),
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Subject: &block.LabelRanges[0],
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})
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}
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}
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for _, blockS := range moduleBlockSchema.Blocks {
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if blockS.Type == v.Name {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid variable name",
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Detail: fmt.Sprintf("The variable name %q is reserved due to its special meaning inside module blocks.", blockS.Type),
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Subject: &block.LabelRanges[0],
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})
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}
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}
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if attr, exists := content.Attributes["description"]; exists {
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valDiags := gohcl.DecodeExpression(attr.Expr, nil, &v.Description)
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diags = append(diags, valDiags...)
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v.DescriptionSet = true
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}
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if attr, exists := content.Attributes["type"]; exists {
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ty, parseMode, tyDiags := decodeVariableType(attr.Expr)
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diags = append(diags, tyDiags...)
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v.ConstraintType = ty
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v.Type = ty.WithoutOptionalAttributesDeep()
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v.ParsingMode = parseMode
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}
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if attr, exists := content.Attributes["sensitive"]; exists {
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valDiags := gohcl.DecodeExpression(attr.Expr, nil, &v.Sensitive)
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diags = append(diags, valDiags...)
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v.SensitiveSet = true
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}
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if attr, exists := content.Attributes["nullable"]; exists {
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valDiags := gohcl.DecodeExpression(attr.Expr, nil, &v.Nullable)
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diags = append(diags, valDiags...)
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v.NullableSet = true
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} else {
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// The current default is true, which is subject to change in a future
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// language edition.
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v.Nullable = true
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}
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if attr, exists := content.Attributes["default"]; exists {
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val, valDiags := attr.Expr.Value(nil)
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diags = append(diags, valDiags...)
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// Convert the default to the expected type so we can catch invalid
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// defaults early and allow later code to assume validity.
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// Note that this depends on us having already processed any "type"
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// attribute above.
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// However, we can't do this if we're in an override file where
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// the type might not be set; we'll catch that during merge.
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if v.ConstraintType != cty.NilType {
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var err error
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val, err = convert.Convert(val, v.ConstraintType)
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if err != nil {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid default value for variable",
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Detail: fmt.Sprintf("This default value is not compatible with the variable's type constraint: %s.", err),
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Subject: attr.Expr.Range().Ptr(),
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})
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val = cty.DynamicVal
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}
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}
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if !v.Nullable && val.IsNull() {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid default value for variable",
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Detail: "A null default value is not valid when nullable=false.",
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Subject: attr.Expr.Range().Ptr(),
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})
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}
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v.Default = val
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}
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for _, block := range content.Blocks {
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switch block.Type {
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case "validation":
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vv, moreDiags := decodeVariableValidationBlock(v.Name, block, override)
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diags = append(diags, moreDiags...)
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v.Validations = append(v.Validations, vv)
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default:
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// The above cases should be exhaustive for all block types
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// defined in variableBlockSchema
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panic(fmt.Sprintf("unhandled block type %q", block.Type))
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}
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}
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return v, diags
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}
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func decodeVariableType(expr hcl.Expression) (cty.Type, VariableParsingMode, hcl.Diagnostics) {
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if exprIsNativeQuotedString(expr) {
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// If a user provides the pre-0.12 form of variable type argument where
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// the string values "string", "list" and "map" are accepted, we
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// provide an error to point the user towards using the type system
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// correctly has a hint.
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// Only the native syntax ends up in this codepath; we handle the
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// JSON syntax (which is, of course, quoted within the type system)
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// in the normal codepath below.
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val, diags := expr.Value(nil)
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if diags.HasErrors() {
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return cty.DynamicPseudoType, VariableParseHCL, diags
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}
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str := val.AsString()
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switch str {
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case "string":
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid quoted type constraints",
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Detail: "Terraform 0.11 and earlier required type constraints to be given in quotes, but that form is now deprecated and will be removed in a future version of Terraform. Remove the quotes around \"string\".",
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Subject: expr.Range().Ptr(),
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})
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return cty.DynamicPseudoType, VariableParseLiteral, diags
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case "list":
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid quoted type constraints",
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Detail: "Terraform 0.11 and earlier required type constraints to be given in quotes, but that form is now deprecated and will be removed in a future version of Terraform. Remove the quotes around \"list\" and write list(string) instead to explicitly indicate that the list elements are strings.",
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Subject: expr.Range().Ptr(),
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})
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return cty.DynamicPseudoType, VariableParseHCL, diags
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case "map":
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid quoted type constraints",
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Detail: "Terraform 0.11 and earlier required type constraints to be given in quotes, but that form is now deprecated and will be removed in a future version of Terraform. Remove the quotes around \"map\" and write map(string) instead to explicitly indicate that the map elements are strings.",
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Subject: expr.Range().Ptr(),
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})
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return cty.DynamicPseudoType, VariableParseHCL, diags
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default:
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return cty.DynamicPseudoType, VariableParseHCL, hcl.Diagnostics{{
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Severity: hcl.DiagError,
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Summary: "Invalid legacy variable type hint",
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Detail: `To provide a full type expression, remove the surrounding quotes and give the type expression directly.`,
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Subject: expr.Range().Ptr(),
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}}
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}
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}
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// First we'll deal with some shorthand forms that the HCL-level type
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// expression parser doesn't include. These both emulate pre-0.12 behavior
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// of allowing a list or map of any element type as long as all of the
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// elements are consistent. This is the same as list(any) or map(any).
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switch hcl.ExprAsKeyword(expr) {
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case "list":
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return cty.List(cty.DynamicPseudoType), VariableParseHCL, nil
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case "map":
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return cty.Map(cty.DynamicPseudoType), VariableParseHCL, nil
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}
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ty, diags := typeexpr.TypeConstraint(expr)
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if diags.HasErrors() {
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return cty.DynamicPseudoType, VariableParseHCL, diags
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}
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switch {
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case ty.IsPrimitiveType():
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// Primitive types use literal parsing.
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return ty, VariableParseLiteral, diags
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default:
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// Everything else uses HCL parsing
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return ty, VariableParseHCL, diags
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}
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}
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// Required returns true if this variable is required to be set by the caller,
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// or false if there is a default value that will be used when it isn't set.
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func (v *Variable) Required() bool {
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return v.Default == cty.NilVal
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}
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// VariableParsingMode defines how values of a particular variable given by
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// text-only mechanisms (command line arguments and environment variables)
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// should be parsed to produce the final value.
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type VariableParsingMode rune
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// VariableParseLiteral is a variable parsing mode that just takes the given
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// string directly as a cty.String value.
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const VariableParseLiteral VariableParsingMode = 'L'
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// VariableParseHCL is a variable parsing mode that attempts to parse the given
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// string as an HCL expression and returns the result.
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const VariableParseHCL VariableParsingMode = 'H'
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// Parse uses the receiving parsing mode to process the given variable value
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// string, returning the result along with any diagnostics.
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//
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// A VariableParsingMode does not know the expected type of the corresponding
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// variable, so it's the caller's responsibility to attempt to convert the
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// result to the appropriate type and return to the user any diagnostics that
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// conversion may produce.
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//
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// The given name is used to create a synthetic filename in case any diagnostics
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// must be generated about the given string value. This should be the name
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// of the root module variable whose value will be populated from the given
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// string.
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//
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// If the returned diagnostics has errors, the returned value may not be
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// valid.
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func (m VariableParsingMode) Parse(name, value string) (cty.Value, hcl.Diagnostics) {
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switch m {
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case VariableParseLiteral:
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return cty.StringVal(value), nil
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case VariableParseHCL:
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fakeFilename := fmt.Sprintf("<value for var.%s>", name)
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expr, diags := hclsyntax.ParseExpression([]byte(value), fakeFilename, hcl.Pos{Line: 1, Column: 1})
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if diags.HasErrors() {
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return cty.DynamicVal, diags
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}
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val, valDiags := expr.Value(nil)
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diags = append(diags, valDiags...)
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return val, diags
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default:
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// Should never happen
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panic(fmt.Errorf("Parse called on invalid VariableParsingMode %#v", m))
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}
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}
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// decodeVariableValidationBlock is a wrapper around decodeCheckRuleBlock
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// that imposes the additional rule that the condition expression can refer
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// only to an input variable of the given name.
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func decodeVariableValidationBlock(varName string, block *hcl.Block, override bool) (*CheckRule, hcl.Diagnostics) {
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vv, diags := decodeCheckRuleBlock(block, override)
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if vv.Condition != nil {
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// The validation condition can only refer to the variable itself,
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// to ensure that the variable declaration can't create additional
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// edges in the dependency graph.
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goodRefs := 0
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for _, traversal := range vv.Condition.Variables() {
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ref, moreDiags := addrs.ParseRef(traversal)
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if !moreDiags.HasErrors() {
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if addr, ok := ref.Subject.(addrs.InputVariable); ok {
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if addr.Name == varName {
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goodRefs++
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continue // Reference is valid
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}
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}
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}
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// If we fall out here then the reference is invalid.
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference in variable validation",
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Detail: fmt.Sprintf("The condition for variable %q can only refer to the variable itself, using var.%s.", varName, varName),
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Subject: traversal.SourceRange().Ptr(),
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})
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}
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if goodRefs < 1 {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid variable validation condition",
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Detail: fmt.Sprintf("The condition for variable %q must refer to var.%s in order to test incoming values.", varName, varName),
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Subject: vv.Condition.Range().Ptr(),
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})
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}
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}
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return vv, diags
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}
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// Output represents an "output" block in a module or file.
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type Output struct {
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Name string
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Description string
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Expr hcl.Expression
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DependsOn []hcl.Traversal
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Sensitive bool
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DescriptionSet bool
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SensitiveSet bool
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DeclRange hcl.Range
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}
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func decodeOutputBlock(block *hcl.Block, override bool) (*Output, hcl.Diagnostics) {
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var diags hcl.Diagnostics
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o := &Output{
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Name: block.Labels[0],
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DeclRange: block.DefRange,
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}
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schema := outputBlockSchema
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if override {
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schema = schemaForOverrides(schema)
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}
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content, moreDiags := block.Body.Content(schema)
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diags = append(diags, moreDiags...)
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if !hclsyntax.ValidIdentifier(o.Name) {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid output name",
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Detail: badIdentifierDetail,
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Subject: &block.LabelRanges[0],
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})
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}
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if attr, exists := content.Attributes["description"]; exists {
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valDiags := gohcl.DecodeExpression(attr.Expr, nil, &o.Description)
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diags = append(diags, valDiags...)
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o.DescriptionSet = true
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}
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if attr, exists := content.Attributes["value"]; exists {
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o.Expr = attr.Expr
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}
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if attr, exists := content.Attributes["sensitive"]; exists {
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valDiags := gohcl.DecodeExpression(attr.Expr, nil, &o.Sensitive)
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diags = append(diags, valDiags...)
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o.SensitiveSet = true
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}
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if attr, exists := content.Attributes["depends_on"]; exists {
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deps, depsDiags := decodeDependsOn(attr)
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diags = append(diags, depsDiags...)
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o.DependsOn = append(o.DependsOn, deps...)
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}
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return o, diags
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}
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// Local represents a single entry from a "locals" block in a module or file.
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// The "locals" block itself is not represented, because it serves only to
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// provide context for us to interpret its contents.
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type Local struct {
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Name string
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Expr hcl.Expression
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DeclRange hcl.Range
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}
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func decodeLocalsBlock(block *hcl.Block) ([]*Local, hcl.Diagnostics) {
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attrs, diags := block.Body.JustAttributes()
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if len(attrs) == 0 {
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return nil, diags
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}
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locals := make([]*Local, 0, len(attrs))
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for name, attr := range attrs {
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if !hclsyntax.ValidIdentifier(name) {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid local value name",
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Detail: badIdentifierDetail,
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Subject: &attr.NameRange,
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})
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}
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locals = append(locals, &Local{
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Name: name,
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Expr: attr.Expr,
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DeclRange: attr.Range,
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})
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}
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return locals, diags
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}
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// Addr returns the address of the local value declared by the receiver,
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// relative to its containing module.
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func (l *Local) Addr() addrs.LocalValue {
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return addrs.LocalValue{
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Name: l.Name,
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}
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}
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var variableBlockSchema = &hcl.BodySchema{
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Attributes: []hcl.AttributeSchema{
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{
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Name: "description",
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},
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{
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Name: "default",
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},
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{
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Name: "type",
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},
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{
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Name: "sensitive",
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},
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{
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Name: "nullable",
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},
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},
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Blocks: []hcl.BlockHeaderSchema{
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{
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Type: "validation",
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},
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},
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}
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var outputBlockSchema = &hcl.BodySchema{
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Attributes: []hcl.AttributeSchema{
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{
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Name: "description",
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},
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{
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Name: "value",
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Required: true,
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},
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{
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Name: "depends_on",
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},
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{
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Name: "sensitive",
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},
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},
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}
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