108 lines
3.8 KiB
Go
108 lines
3.8 KiB
Go
// Copyright 2018 The Go Cloud Development Kit Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package aws provides fundamental Wire providers for Amazon Web Services (AWS).
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package aws // import "gocloud.dev/aws"
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import (
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"fmt"
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"net/url"
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"strconv"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/client"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/google/wire"
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)
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// DefaultSession is a Wire provider set that provides a *session.Session using
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// the default options.
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var DefaultSession = wire.NewSet(
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SessionConfig,
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ConfigCredentials,
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NewDefaultSession,
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wire.Bind(new(client.ConfigProvider), new(*session.Session)),
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)
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// NewDefaultSession returns a *session.Session using the default options.
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func NewDefaultSession() (*session.Session, error) {
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return session.NewSessionWithOptions(session.Options{SharedConfigState: session.SharedConfigEnable})
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}
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// SessionConfig returns sess.Config.
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func SessionConfig(sess *session.Session) *aws.Config {
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return sess.Config
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}
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// ConfigCredentials returns cfg.Credentials.
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func ConfigCredentials(cfg *aws.Config) *credentials.Credentials {
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return cfg.Credentials
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}
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// ConfigOverrider implements client.ConfigProvider by overlaying a list of
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// configurations over a base configuration provider.
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type ConfigOverrider struct {
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Base client.ConfigProvider
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Configs []*aws.Config
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}
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// ClientConfig calls the base provider's ClientConfig method with co.Configs
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// followed by the arguments given to ClientConfig.
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func (co ConfigOverrider) ClientConfig(serviceName string, cfgs ...*aws.Config) client.Config {
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cfgs = append(co.Configs[:len(co.Configs):len(co.Configs)], cfgs...)
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return co.Base.ClientConfig(serviceName, cfgs...)
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}
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// ConfigFromURLParams returns an aws.Config initialized based on the URL
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// parameters in q. It is intended to be used by URLOpeners for AWS services.
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// https://docs.aws.amazon.com/sdk-for-go/api/aws/#Config
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//
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// It returns an error if q contains any unknown query parameters; callers
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// should remove any query parameters they know about from q before calling
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// ConfigFromURLParams.
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//
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// The following query options are supported:
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// - region: The AWS region for requests; sets aws.Config.Region.
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// - endpoint: The endpoint URL (hostname only or fully qualified URI); sets aws.Config.Endpoint.
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// - disableSSL: A value of "true" disables SSL when sending requests; sets aws.Config.DisableSSL.
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// - s3ForcePathStyle: A value of "true" forces the request to use path-style addressing; sets aws.Config.S3ForcePathStyle.
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func ConfigFromURLParams(q url.Values) (*aws.Config, error) {
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var cfg aws.Config
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for param, values := range q {
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value := values[0]
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switch param {
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case "region":
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cfg.Region = aws.String(value)
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case "endpoint":
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cfg.Endpoint = aws.String(value)
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case "disableSSL":
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b, err := strconv.ParseBool(value)
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if err != nil {
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return nil, fmt.Errorf("invalid value for query parameter %q: %v", param, err)
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}
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cfg.DisableSSL = aws.Bool(b)
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case "s3ForcePathStyle":
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b, err := strconv.ParseBool(value)
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if err != nil {
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return nil, fmt.Errorf("invalid value for query parameter %q: %v", param, err)
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}
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cfg.S3ForcePathStyle = aws.Bool(b)
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default:
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return nil, fmt.Errorf("unknown query parameter %q", param)
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}
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}
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return &cfg, nil
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}
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