WIP: providers/google: Support IAM permissions for GCP projects

This change adds a data source to allow declaring IAM policies, as well as a
new resource to represent an existing GCP project. The project resource may
reference an IAM policy, allowing a user to set project-wide permissions.

builtin/providers/google/config.go

@@ -13,6 +13,7 @@ import (
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"golang.org/x/oauth2/jwt"
+	"google.golang.org/api/cloudresourcemanager/v1"
 	"google.golang.org/api/compute/v1"
 	"google.golang.org/api/container/v1"
 	"google.golang.org/api/dns/v1"
@@ -28,12 +29,13 @@ type Config struct {
 	Project     string
 	Region      string
 
-	clientCompute   *compute.Service
-	clientContainer *container.Service
-	clientDns       *dns.Service
-	clientStorage   *storage.Service
-	clientSqlAdmin  *sqladmin.Service
-	clientPubsub    *pubsub.Service
+	clientCompute         *compute.Service
+	clientContainer       *container.Service
+	clientDns             *dns.Service
+	clientPubsub          *pubsub.Service
+	clientResourceManager *cloudresourcemanager.Service
+	clientStorage         *storage.Service
+	clientSqlAdmin        *sqladmin.Service
 }
 
 func (c *Config) loadAndValidate() error {
@@ -133,6 +135,13 @@ func (c *Config) loadAndValidate() error {
 	}
 	c.clientPubsub.UserAgent = userAgent
 
+	log.Printf("[INFO] Instatiating Google CloudResourceManager Client...")
+	c.clientResourceManager, err = cloudresourcemanager.New(client)
+	if err != nil {
+		return err
+	}
+	c.clientPubsub.UserAgent = userAgent
+
 	return nil
 }
 

builtin/providers/google/data_source_google_iam_policy_document.go

@@ -0,0 +1,81 @@
+package google
+
+import (
+	"encoding/json"
+	"strconv"
+
+	"github.com/hashicorp/terraform/helper/hashcode"
+	"github.com/hashicorp/terraform/helper/schema"
+	"google.golang.org/api/cloudresourcemanager/v1"
+)
+
+func dataSourceGoogleIamPolicy() *schema.Resource {
+	return &schema.Resource{
+		Read: dataSourceGoogleIamPolicyRead,
+
+		Schema: map[string]*schema.Schema{
+			"binding": {
+				Type:     schema.TypeSet,
+				Required: true,
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"role": {
+							Type:     schema.TypeString,
+							Required: true,
+						},
+						"members": {
+							Type:     schema.TypeSet,
+							Required: true,
+							Elem:     &schema.Schema{Type: schema.TypeString},
+							Set:      schema.HashString,
+						},
+					},
+				},
+			},
+			"policy": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+		},
+	}
+}
+
+func dataSourceGoogleIamPolicyMembers(d *schema.Set) []string {
+	var members []string
+	members = make([]string, d.Len())
+
+	for i, v := range d.List() {
+		members[i] = v.(string)
+	}
+	return members
+}
+
+func dataSourceGoogleIamPolicyRead(d *schema.ResourceData, meta interface{}) error {
+	doc := &cloudresourcemanager.Policy{}
+
+	var bindings []*cloudresourcemanager.Binding
+
+	bindingStatements := d.Get("binding").(*schema.Set)
+	bindings = make([]*cloudresourcemanager.Binding, bindingStatements.Len())
+	doc.Bindings = bindings
+
+	for i, bindingRaw := range bindingStatements.List() {
+		bindingStatement := bindingRaw.(map[string]interface{})
+		doc.Bindings[i] = &cloudresourcemanager.Binding{
+			Role:    bindingStatement["role"].(string),
+			Members: dataSourceGoogleIamPolicyMembers(bindingStatement["members"].(*schema.Set)),
+		}
+	}
+
+	jsonDoc, err := json.MarshalIndent(doc, "", "  ")
+	if err != nil {
+		// should never happen if the above code is correct
+		return err
+	}
+	jsonString := string(jsonDoc)
+
+	d.Set("policy", jsonString)
+	d.SetId(strconv.Itoa(hashcode.String(jsonString)))
+
+	return nil
+}

builtin/providers/google/provider.go

@@ -56,6 +56,10 @@ func Provider() terraform.ResourceProvider {
 			},
 		},
 
+		DataSourcesMap: map[string]*schema.Resource{
+			"google_iam_policy": dataSourceGoogleIamPolicy(),
+		},
+
 		ResourcesMap: map[string]*schema.Resource{
 			"google_compute_autoscaler":             resourceComputeAutoscaler(),
 			"google_compute_address":                resourceComputeAddress(),
@@ -89,6 +93,7 @@ func Provider() terraform.ResourceProvider {
 			"google_sql_database":                   resourceSqlDatabase(),
 			"google_sql_database_instance":          resourceSqlDatabaseInstance(),
 			"google_sql_user":                       resourceSqlUser(),
+			"google_project":                        resourceGoogleProject(),
 			"google_pubsub_topic":                   resourcePubsubTopic(),
 			"google_pubsub_subscription":            resourcePubsubSubscription(),
 			"google_storage_bucket":                 resourceStorageBucket(),

builtin/providers/google/resource_google_project.go

@@ -0,0 +1,271 @@
+package google
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+
+	"github.com/hashicorp/terraform/helper/schema"
+	"google.golang.org/api/cloudresourcemanager/v1"
+	"google.golang.org/api/googleapi"
+)
+
+func resourceGoogleProject() *schema.Resource {
+	return &schema.Resource{
+		Create: resourceGoogleProjectCreate,
+		Read:   resourceGoogleProjectRead,
+		Update: resourceGoogleProjectUpdate,
+		Delete: resourceGoogleProjectDelete,
+
+		Schema: map[string]*schema.Schema{
+			"project": &schema.Schema{
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+
+			"policy": &schema.Schema{
+				Type:     schema.TypeString,
+				Optional: true,
+			},
+
+			"name": &schema.Schema{
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
+			"number": &schema.Schema{
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
+			"id": &schema.Schema{
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+		},
+	}
+}
+
+func resourceGoogleProjectCreate(d *schema.ResourceData, meta interface{}) error {
+	config := meta.(*Config)
+
+	project, err := getProject(d, config)
+	if err != nil {
+		return err
+	}
+
+	d.SetId(project)
+	if err := resourceGoogleProjectRead(d, meta); err != nil {
+		return err
+	}
+
+	// Apply the IAM policy if it is set
+	if pString, ok := d.GetOk("policy"); ok {
+		// The policy string is just a marshaled cloudresourcemanager.Policy.
+		// Unmarshal it to a struct.
+		var policy cloudresourcemanager.Policy
+		if err = json.Unmarshal([]byte(pString.(string)), &policy); err != nil {
+			return err
+		}
+
+		// Retrieve existing IAM policy from project. This will be merged
+		// with the policy defined here.
+		// TODO(evanbrown): Add an 'authoritative' flag that allows policy
+		// in manifest to overwrite existing policy.
+		p, err := getProjectIamPolicy(project, config)
+		if err != nil {
+			return err
+		}
+		log.Printf("[DEBUG] Got existing bindings from project: %#v", p.Bindings)
+
+		// Merge the existing policy bindings with those defined in this manifest.
+		p.Bindings = mergeBindings(append(p.Bindings, policy.Bindings...))
+
+		// Apply the merged policy
+		log.Printf("[DEBUG] Setting new policy for project: %#v", p)
+		_, err = config.clientResourceManager.Projects.SetIamPolicy(project,
+			&cloudresourcemanager.SetIamPolicyRequest{Policy: p}).Do()
+
+		if err != nil {
+			return fmt.Errorf("Error applying IAM policy for project %q: %s", project, err)
+		}
+	}
+	return nil
+}
+
+func resourceGoogleProjectRead(d *schema.ResourceData, meta interface{}) error {
+	config := meta.(*Config)
+	project, err := getProject(d, config)
+	if err != nil {
+		return err
+	}
+
+	// Confirm the project exists.
+	// TODO(evanbrown): Support project creation
+	p, err := config.clientResourceManager.Projects.Get(project).Do()
+	if err != nil {
+		if v, ok := err.(*googleapi.Error); ok && v.Code == http.StatusNotFound {
+			return fmt.Errorf("Project %q does not exist. The Google provider does not currently support new project creation.", project)
+		}
+		return fmt.Errorf("Error checking project %q: %s", project, err)
+	}
+
+	d.Set("number", strconv.FormatInt(int64(p.ProjectNumber), 10))
+	d.Set("name", p.Name)
+
+	return nil
+}
+
+func resourceGoogleProjectUpdate(d *schema.ResourceData, meta interface{}) error {
+	config := meta.(*Config)
+	project, err := getProject(d, config)
+	if err != nil {
+		return err
+	}
+
+	// Policy has changed
+	if ok := d.HasChange("policy"); ok {
+		// The policy string is just a marshaled cloudresourcemanager.Policy.
+		// Unmarshal it to a struct that contains the old and new policies
+		oldPString, newPString := d.GetChange("policy")
+		var oldPolicy, newPolicy cloudresourcemanager.Policy
+		if err = json.Unmarshal([]byte(newPString.(string)), &newPolicy); err != nil {
+			return err
+		}
+		if err = json.Unmarshal([]byte(oldPString.(string)), &oldPolicy); err != nil {
+			return err
+		}
+
+		// Find any Roles and Members that were removed (i.e., those that are present
+		// in the old but absent in the new
+		oldMap := rolesToMembersMap(oldPolicy.Bindings)
+		newMap := rolesToMembersMap(newPolicy.Bindings)
+		deleted := make(map[string]string)
+
+		// Get each role and its associated members in the old state
+		for role, members := range oldMap {
+			// The role exists in the new state
+			if _, ok := newMap[role]; ok {
+				// Check each memeber
+				for member, _ := range members {
+					// Member does not exist in new state, so it was deleted
+					if _, ok = newMap[role][member]; !ok {
+						deleted[role] = member
+					}
+				}
+			} else {
+				// This indicates an entire role was deleted. Mark all members
+				// for delete.
+				for member, _ := range members {
+					deleted[role] = member
+				}
+			}
+		}
+		log.Printf("[DEBUG] Roles and Members to be deleted: %#v", deleted)
+
+		// Retrieve existing IAM policy from project. This will be merged
+		// with the policy in the current state
+		// TODO(evanbrown): Add an 'authoritative' flag that allows policy
+		// in manifest to overwrite existing policy.
+		p, err := getProjectIamPolicy(project, config)
+		if err != nil {
+			return err
+		}
+		log.Printf("[DEBUG] Got existing bindings from project: %#v", p.Bindings)
+
+		// Merge existing policy with policy in the current state
+		log.Printf("[DEBUG] Merging new bindings from project: %#v", newPolicy.Bindings)
+		mergedBindings := mergeBindings(append(p.Bindings, newPolicy.Bindings...))
+
+		// Remove any roles and members that were explicitly deleted
+		mergedBindingsMap := rolesToMembersMap(mergedBindings)
+		for role, member := range deleted {
+			delete(mergedBindingsMap[role], member)
+		}
+
+		p.Bindings = rolesToMembersBinding(mergedBindingsMap)
+		log.Printf("[DEBUG] Setting new policy for project: %#v", p)
+
+		dump, _ := json.MarshalIndent(p.Bindings, " ", "  ")
+		log.Printf(string(dump))
+		_, err = config.clientResourceManager.Projects.SetIamPolicy(project,
+			&cloudresourcemanager.SetIamPolicyRequest{Policy: p}).Do()
+
+		if err != nil {
+			return fmt.Errorf("Error applying IAM policy for project %q: %s", project, err)
+		}
+	}
+
+	return nil
+}
+
+func resourceGoogleProjectDelete(d *schema.ResourceData, meta interface{}) error {
+	d.SetId("")
+	return nil
+}
+
+func getProjectIamPolicy(project string, config *Config) (*cloudresourcemanager.Policy, error) {
+	p, err := config.clientResourceManager.Projects.GetIamPolicy(project,
+		&cloudresourcemanager.GetIamPolicyRequest{}).Do()
+
+	if err != nil {
+		return nil, fmt.Errorf("Error retrieving IAM policy for project %q: %s", project, err)
+	}
+	return p, nil
+}
+
+// Convert a map of roles->members to a list of Binding
+func rolesToMembersBinding(m map[string]map[string]bool) []*cloudresourcemanager.Binding {
+	bindings := make([]*cloudresourcemanager.Binding, 0)
+	for role, members := range m {
+		b := cloudresourcemanager.Binding{
+			Role:    role,
+			Members: make([]string, 0),
+		}
+		for m, _ := range members {
+			b.Members = append(b.Members, m)
+		}
+		bindings = append(bindings, &b)
+	}
+	return bindings
+}
+
+// Map a role to a map of members, allowing easy merging of multiple bindings.
+func rolesToMembersMap(bindings []*cloudresourcemanager.Binding) map[string]map[string]bool {
+	bm := make(map[string]map[string]bool)
+	// Get each binding
+	for _, b := range bindings {
+		// Initialize members map
+		if _, ok := bm[b.Role]; !ok {
+			bm[b.Role] = make(map[string]bool)
+		}
+		// Get each member (user/principal) for the binding
+		for _, m := range b.Members {
+			// Add the member
+			bm[b.Role][m] = true
+		}
+	}
+	return bm
+}
+
+// Merge multiple Bindings such that Bindings with the same Role result in
+// a single Binding with combined Members
+func mergeBindings(bindings []*cloudresourcemanager.Binding) []*cloudresourcemanager.Binding {
+	bm := rolesToMembersMap(bindings)
+	rb := make([]*cloudresourcemanager.Binding, 0)
+
+	for role, members := range bm {
+		var b cloudresourcemanager.Binding
+		b.Role = role
+		b.Members = make([]string, 0)
+		for m, _ := range members {
+			b.Members = append(b.Members, m)
+		}
+		rb = append(rb, &b)
+	}
+
+	return rb
+}

builtin/providers/google/resource_google_project_test.go

@@ -0,0 +1,198 @@
+package google
+
+import (
+	"reflect"
+	"sort"
+	"testing"
+
+	"google.golang.org/api/cloudresourcemanager/v1"
+)
+
+type Binding []cloudresourcemanager.Binding
+
+func (b Binding) Len() int {
+	return len(b)
+}
+
+func (b Binding) Swap(i, j int) {
+	b[i], b[j] = b[j], b[i]
+}
+
+func (b Binding) Less(i, j int) bool {
+	return b[i].Role < b[j].Role
+}
+
+func TestIamMapRolesToMembers(t *testing.T) {
+	table := []struct {
+		input  []cloudresourcemanager.Binding
+		expect map[string]map[string]bool
+	}{
+		{
+			input: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-1",
+						"member-2",
+					},
+				},
+			},
+			expect: map[string]map[string]bool{
+				"role-1": map[string]bool{
+					"member-1": true,
+					"member-2": true,
+				},
+			},
+		},
+		{
+			input: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-1",
+						"member-2",
+						"member-1",
+						"member-2",
+					},
+				},
+			},
+			expect: map[string]map[string]bool{
+				"role-1": map[string]bool{
+					"member-1": true,
+					"member-2": true,
+				},
+			},
+		},
+		{
+			input: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+				},
+			},
+			expect: map[string]map[string]bool{
+				"role-1": map[string]bool{},
+			},
+		},
+	}
+
+	for _, test := range table {
+		got := mapRolesToMembers(test.input)
+		if !reflect.DeepEqual(got, test.expect) {
+			t.Errorf("got %+v, expected %+v", got, test.expect)
+		}
+	}
+}
+
+func TestIamMergeBindings(t *testing.T) {
+	table := []struct {
+		input  []cloudresourcemanager.Binding
+		expect []cloudresourcemanager.Binding
+	}{
+		{
+			input: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-1",
+						"member-2",
+					},
+				},
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-3",
+					},
+				},
+			},
+			expect: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-1",
+						"member-2",
+						"member-3",
+					},
+				},
+			},
+		},
+		{
+			input: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-3",
+						"member-4",
+					},
+				},
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-2",
+						"member-1",
+					},
+				},
+				{
+					Role: "role-2",
+					Members: []string{
+						"member-1",
+					},
+				},
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-5",
+					},
+				},
+				{
+					Role: "role-3",
+					Members: []string{
+						"member-1",
+					},
+				},
+				{
+					Role: "role-2",
+					Members: []string{
+						"member-2",
+					},
+				},
+			},
+			expect: []cloudresourcemanager.Binding{
+				{
+					Role: "role-1",
+					Members: []string{
+						"member-1",
+						"member-2",
+						"member-3",
+						"member-4",
+						"member-5",
+					},
+				},
+				{
+					Role: "role-2",
+					Members: []string{
+						"member-1",
+						"member-2",
+					},
+				},
+				{
+					Role: "role-3",
+					Members: []string{
+						"member-1",
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range table {
+		got := mergeBindings(test.input)
+		sort.Sort(Binding(got))
+		for i, _ := range got {
+			sort.Strings(got[i].Members)
+		}
+
+		if !reflect.DeepEqual(got, test.expect) {
+			t.Errorf("\ngot %+v\nexpected %+v", got, test.expect)
+		}
+	}
+}