63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
package middlewares
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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"github.com/vulcand/oxy/v2/utils"
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)
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// GetSourceExtractor returns the SourceExtractor function corresponding to the given sourceMatcher.
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// It defaults to a RemoteAddrStrategy IPStrategy if need be.
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// It returns an error if more than one source criterion is provided.
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func GetSourceExtractor(ctx context.Context, sourceMatcher *dynamic.SourceCriterion) (utils.SourceExtractor, error) {
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if sourceMatcher != nil {
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if sourceMatcher.IPStrategy != nil && sourceMatcher.RequestHeaderName != "" {
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return nil, errors.New("iPStrategy and RequestHeaderName are mutually exclusive")
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}
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if sourceMatcher.IPStrategy != nil && sourceMatcher.RequestHost {
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return nil, errors.New("iPStrategy and RequestHost are mutually exclusive")
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}
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if sourceMatcher.RequestHeaderName != "" && sourceMatcher.RequestHost {
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return nil, errors.New("requestHost and RequestHeaderName are mutually exclusive")
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}
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}
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if sourceMatcher == nil ||
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sourceMatcher.IPStrategy == nil &&
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sourceMatcher.RequestHeaderName == "" && !sourceMatcher.RequestHost {
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sourceMatcher = &dynamic.SourceCriterion{
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IPStrategy: &dynamic.IPStrategy{},
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}
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}
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logger := log.Ctx(ctx)
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if sourceMatcher.IPStrategy != nil {
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strategy, err := sourceMatcher.IPStrategy.Get()
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if err != nil {
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return nil, err
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}
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logger.Debug().Msg("Using IPStrategy")
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return utils.ExtractorFunc(func(req *http.Request) (string, int64, error) {
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return strategy.GetIP(req), 1, nil
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}), nil
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}
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if sourceMatcher.RequestHeaderName != "" {
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logger.Debug().Msg("Using RequestHeaderName")
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return utils.NewExtractor(fmt.Sprintf("request.header.%s", sourceMatcher.RequestHeaderName))
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}
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if sourceMatcher.RequestHost {
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logger.Debug().Msg("Using RequestHost")
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return utils.NewExtractor("request.host")
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}
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return nil, errors.New("no SourceCriterion criterion defined")
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}
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