/
step_ServerRedirect.go
54 lines (39 loc) · 1.41 KB
/
step_ServerRedirect.go
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package builder
import (
"io"
"github.com/benpate/derp"
)
// StepServerRedirect represents an action-step that continues building the output stream as
// a GET request to a new action.
type StepServerRedirect struct {
On string // "get" or "post" or "both"
Action string
}
func (step StepServerRedirect) Get(builder Builder, buffer io.Writer) PipelineBehavior {
if step.On == "post" {
return nil
}
return step.redirect(builder, buffer)
}
// Post updates the stream with approved data from the request body.
func (step StepServerRedirect) Post(builder Builder, _ io.Writer) PipelineBehavior {
if step.On == "get" {
return nil
}
return step.redirect(builder, builder.response())
}
// redirect creates a new builder on this object with the requested Action and then continues as a GET request.
func (step StepServerRedirect) redirect(builder Builder, buffer io.Writer) PipelineBehavior {
newBuilder, err := builder.clone(step.Action)
if err != nil {
return Halt().WithError(derp.Wrap(err, "build.StepServerRedirect.Redirect", "Error creating new builder"))
}
result, err := newBuilder.Render()
if err != nil {
return Halt().WithError(derp.Wrap(err, "build.StepServerRedirect.Redirect", "Error building new page"))
}
if _, err := buffer.Write([]byte(result)); err != nil {
return Halt().WithError(derp.Wrap(err, "build.StepServerRedirect.Redirect", "Error writing output buffer"))
}
return nil
}