Martino Ferrari
28 lines
1.0 KiB
Go
28 lines
1.0 KiB
Go
package datasource
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import "context"
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// userKey is the unexported context key under which the end-user identity is
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// stored. Using a private type prevents collisions with other packages.
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type userKey struct{}
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// WithUser returns a copy of ctx carrying the end-user identity associated with
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// the request (e.g. the authenticated web client). Data sources may use this to
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// attribute operations to the actual user rather than the server process — for
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// example EPICS Channel Access access-security rules match on the client
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// username. An empty user is treated as "no client identity".
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func WithUser(ctx context.Context, user string) context.Context {
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if user == "" {
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return ctx
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}
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return context.WithValue(ctx, userKey{}, user)
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}
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// UserFrom returns the end-user identity stored in ctx by WithUser. The boolean
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// is false when no (non-empty) identity is present, in which case callers
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// should fall back to the server's own identity.
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func UserFrom(ctx context.Context) (string, bool) {
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u, ok := ctx.Value(userKey{}).(string)
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return u, ok && u != ""
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}
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