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author | Christopher Speller <crspeller@gmail.com> | 2017-05-17 16:51:25 -0400 |
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committer | GitHub <noreply@github.com> | 2017-05-17 16:51:25 -0400 |
commit | d103ed6ca97ca5a2669f6cf5fe4b3d2a9c945f26 (patch) | |
tree | dbde13123c6add150448f7b75753ac022d862475 /vendor/github.com/minio/minio-go/pkg/credentials/chain.go | |
parent | cd23b8139a9463b67e3096744321f6f4eb0ca40a (diff) | |
download | chat-d103ed6ca97ca5a2669f6cf5fe4b3d2a9c945f26.tar.gz chat-d103ed6ca97ca5a2669f6cf5fe4b3d2a9c945f26.tar.bz2 chat-d103ed6ca97ca5a2669f6cf5fe4b3d2a9c945f26.zip |
Upgrading server dependancies (#6431)
Diffstat (limited to 'vendor/github.com/minio/minio-go/pkg/credentials/chain.go')
-rw-r--r-- | vendor/github.com/minio/minio-go/pkg/credentials/chain.go | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/vendor/github.com/minio/minio-go/pkg/credentials/chain.go b/vendor/github.com/minio/minio-go/pkg/credentials/chain.go new file mode 100644 index 000000000..6b0e57440 --- /dev/null +++ b/vendor/github.com/minio/minio-go/pkg/credentials/chain.go @@ -0,0 +1,89 @@ +/* + * Minio Go Library for Amazon S3 Compatible Cloud Storage + * (C) 2017 Minio, Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package credentials + +import "fmt" + +// A Chain will search for a provider which returns credentials +// and cache that provider until Retrieve is called again. +// +// The Chain provides a way of chaining multiple providers together +// which will pick the first available using priority order of the +// Providers in the list. +// +// If none of the Providers retrieve valid credentials Value, ChainProvider's +// Retrieve() will return the error, collecting all errors from all providers. +// +// If a Provider is found which returns valid credentials Value ChainProvider +// will cache that Provider for all calls to IsExpired(), until Retrieve is +// called again. +// +// creds := credentials.NewChainCredentials( +// []credentials.Provider{ +// &credentials.EnvAWSS3{}, +// &credentials.EnvMinio{}, +// }) +// +// // Usage of ChainCredentials. +// mc, err := minio.NewWithCredentials(endpoint, creds, secure, "us-east-1") +// if err != nil { +// log.Fatalln(err) +// } +// +type Chain struct { + Providers []Provider + curr Provider +} + +// NewChainCredentials returns a pointer to a new Credentials object +// wrapping a chain of providers. +func NewChainCredentials(providers []Provider) *Credentials { + return New(&Chain{ + Providers: append([]Provider{}, providers...), + }) +} + +// Retrieve returns the credentials value or error if no provider returned +// without error. +// +// If a provider is found it will be cached and any calls to IsExpired() +// will return the expired state of the cached provider. +func (c *Chain) Retrieve() (Value, error) { + var errs []error + for _, p := range c.Providers { + creds, err := p.Retrieve() + if err != nil { + errs = append(errs, err) + continue + } // Success. + c.curr = p + return creds, nil + } + c.curr = nil + return Value{}, fmt.Errorf("No valid providers found %v", errs) +} + +// IsExpired will returned the expired state of the currently cached provider +// if there is one. If there is no current provider, true will be returned. +func (c *Chain) IsExpired() bool { + if c.curr != nil { + return c.curr.IsExpired() + } + + return true +} |