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112 lines
3.5 KiB
Go
112 lines
3.5 KiB
Go
package s3
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import (
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"net/url"
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"os"
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"path"
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"strings"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/options"
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)
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// Config contains all configuration necessary to connect to an s3 compatible
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// server.
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type Config struct {
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Endpoint string
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UseHTTP bool
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KeyID string
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Secret options.SecretString
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Bucket string
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Prefix string
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Layout string `option:"layout" help:"use this backend layout (default: auto-detect) (deprecated)"`
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StorageClass string `option:"storage-class" help:"set S3 storage class (STANDARD, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING or REDUCED_REDUNDANCY)"`
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Connections uint `option:"connections" help:"set a limit for the number of concurrent connections (default: 5)"`
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MaxRetries uint `option:"retries" help:"set the number of retries attempted"`
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Region string `option:"region" help:"set region"`
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BucketLookup string `option:"bucket-lookup" help:"bucket lookup style: 'auto', 'dns', or 'path'"`
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ListObjectsV1 bool `option:"list-objects-v1" help:"use deprecated V1 api for ListObjects calls"`
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UnsafeAnonymousAuth bool `option:"unsafe-anonymous-auth" help:"use anonymous authentication"`
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}
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// NewConfig returns a new Config with the default values filled in.
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func NewConfig() Config {
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return Config{
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Connections: 5,
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ListObjectsV1: false,
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}
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}
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func init() {
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options.Register("s3", Config{})
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}
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// ParseConfig parses the string s and extracts the s3 config. The two
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// supported configuration formats are s3://host/bucketname/prefix and
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// s3:host/bucketname/prefix. The host can also be a valid s3 region
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// name. If no prefix is given the prefix "restic" will be used.
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func ParseConfig(s string) (*Config, error) {
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switch {
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case strings.HasPrefix(s, "s3:http"):
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// assume that a URL has been specified, parse it and
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// use the host as the endpoint and the path as the
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// bucket name and prefix
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url, err := url.Parse(s[3:])
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if err != nil {
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return nil, errors.WithStack(err)
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}
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if url.Path == "" {
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return nil, errors.New("s3: bucket name not found")
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}
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bucket, path, _ := strings.Cut(url.Path[1:], "/")
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return createConfig(url.Host, bucket, path, url.Scheme == "http")
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case strings.HasPrefix(s, "s3://"):
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s = s[5:]
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case strings.HasPrefix(s, "s3:"):
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s = s[3:]
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default:
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return nil, errors.New("s3: invalid format")
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}
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// use the first entry of the path as the endpoint and the
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// remainder as bucket name and prefix
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endpoint, rest, _ := strings.Cut(s, "/")
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bucket, prefix, _ := strings.Cut(rest, "/")
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return createConfig(endpoint, bucket, prefix, false)
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}
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func createConfig(endpoint, bucket, prefix string, useHTTP bool) (*Config, error) {
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if endpoint == "" {
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return nil, errors.New("s3: invalid format, host/region or bucket name not found")
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}
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if prefix != "" {
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prefix = path.Clean(prefix)
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}
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cfg := NewConfig()
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cfg.Endpoint = endpoint
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cfg.UseHTTP = useHTTP
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cfg.Bucket = bucket
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cfg.Prefix = prefix
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return &cfg, nil
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}
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var _ backend.ApplyEnvironmenter = &Config{}
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// ApplyEnvironment saves values from the environment to the config.
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func (cfg *Config) ApplyEnvironment(prefix string) {
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if cfg.KeyID == "" {
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cfg.KeyID = os.Getenv(prefix + "AWS_ACCESS_KEY_ID")
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}
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if cfg.Secret.String() == "" {
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cfg.Secret = options.NewSecretString(os.Getenv(prefix + "AWS_SECRET_ACCESS_KEY"))
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}
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if cfg.Region == "" {
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cfg.Region = os.Getenv(prefix + "AWS_DEFAULT_REGION")
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}
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}
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