1 files changed, 88 insertions, 0 deletions

diff --git a/vendor/github.com/minio/minio-go/v7/pkg/credentials/chain.go b/vendor/github.com/minio/minio-go/v7/pkg/credentials/chain.go
new file mode 100644
index 0000000..ddccfb1
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/pkg/credentials/chain.go
@@ -0,0 +1,88 @@
+/*
+ * MinIO Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 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
+
+// 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 no credentials value.
+//
+// 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 after IsExpired() is true.
+//
+//      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, returns no credentials(anonymous)
+// if no credentials provider returned any value.
+//
+// If a provider is found with credentials, it will be cached and any calls
+// to IsExpired() will return the expired state of the cached provider.
+func (c *Chain) Retrieve() (Value, error) {
+        for _, p := range c.Providers {
+                creds, _ := p.Retrieve()
+                // Always prioritize non-anonymous providers, if any.
+                if creds.AccessKeyID == "" && creds.SecretAccessKey == "" {
+                        continue
+                }
+                c.curr = p
+                return creds, nil
+        }
+        // At this point we have exhausted all the providers and
+        // are left without any credentials return anonymous.
+        return Value{
+                SignerType: SignatureAnonymous,
+        }, nil
+}
+
+// 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
+}