55 lines
1.9 KiB
Go
55 lines
1.9 KiB
Go
package auth
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import (
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"net/http"
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"github.com/hashicorp/terraform/svchost"
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)
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// Credentials is a list of CredentialsSource objects that can be tried in
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// turn until one returns credentials for a host, or one returns an error.
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//
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// A Credentials is itself a CredentialsSource, wrapping its members.
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// In principle one CredentialsSource can be nested inside another, though
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// there is no good reason to do so.
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type Credentials []CredentialsSource
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// A CredentialsSource is an object that may be able to provide credentials
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// for a given host.
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//
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// Credentials lookups are not guaranteed to be concurrency-safe. Callers
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// using these facilities in concurrent code must use external concurrency
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// primitives to prevent race conditions.
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type CredentialsSource interface {
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// ForHost returns a non-nil HostCredentials if the source has credentials
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// available for the host, and a nil HostCredentials if it does not.
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//
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// If an error is returned, progress through a list of CredentialsSources
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// is halted and the error is returned to the user.
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ForHost(host svchost.Hostname) (HostCredentials, error)
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}
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// HostCredentials represents a single set of credentials for a particular
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// host.
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type HostCredentials interface {
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// PrepareRequest modifies the given request in-place to apply the
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// receiving credentials. The usual behavior of this method is to
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// add some sort of Authorization header to the request.
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PrepareRequest(req *http.Request)
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}
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// ForHost iterates over the contained CredentialsSource objects and
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// tries to obtain credentials for the given host from each one in turn.
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//
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// If any source returns either a non-nil HostCredentials or a non-nil error
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// then this result is returned. Otherwise, the result is nil, nil.
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func (c Credentials) ForHost(host svchost.Hostname) (HostCredentials, error) {
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for _, source := range c {
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creds, err := source.ForHost(host)
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if creds != nil || err != nil {
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return creds, err
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}
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}
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return nil, nil
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}
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