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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Tests a Go CGI program running under a Go CGI host process.
// Further, the two programs are the same binary, just checking
// their environment to figure out what mode to run in.

package cgi

import (
        "fmt"
        "net/http"
        "os"
        "testing"
)

// This test is a CGI host (testing host.go) that runs its own binary
// as a child process testing the other half of CGI (child.go).
func TestHostingOurselves(t *testing.T) {
        h := &Handler{
                Path: os.Args[0],
                Root: "/test.go",
                Args: []string{"-test.run=TestBeChildCGIProcess"},
        }
        expectedMap := map[string]string{
                "test":                  "Hello CGI-in-CGI",
                "param-a":               "b",
                "param-foo":             "bar",
                "env-GATEWAY_INTERFACE": "CGI/1.1",
                "env-HTTP_HOST":         "example.com",
                "env-PATH_INFO":         "",
                "env-QUERY_STRING":      "foo=bar&a=b",
                "env-REMOTE_ADDR":       "1.2.3.4",
                "env-REMOTE_HOST":       "1.2.3.4",
                "env-REQUEST_METHOD":    "GET",
                "env-REQUEST_URI":       "/test.go?foo=bar&a=b",
                "env-SCRIPT_FILENAME":   os.Args[0],
                "env-SCRIPT_NAME":       "/test.go",
                "env-SERVER_NAME":       "example.com",
                "env-SERVER_PORT":       "80",
                "env-SERVER_SOFTWARE":   "go",
        }
        replay := runCgiTest(t, h, "GET /test.go?foo=bar&a=b HTTP/1.0\nHost: example.com\n\n", expectedMap)

        if expected, got := "text/html; charset=utf-8", replay.Header().Get("Content-Type"); got != expected {
                t.Errorf("got a Content-Type of %q; expected %q", got, expected)
        }
        if expected, got := "X-Test-Value", replay.Header().Get("X-Test-Header"); got != expected {
                t.Errorf("got a X-Test-Header of %q; expected %q", got, expected)
        }
}

// Note: not actually a test.
func TestBeChildCGIProcess(t *testing.T) {
        if os.Getenv("REQUEST_METHOD") == "" {
                // Not in a CGI environment; skipping test.
                return
        }
        Serve(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
                rw.Header().Set("X-Test-Header", "X-Test-Value")
                fmt.Fprintf(rw, "test=Hello CGI-in-CGI\n")
                req.ParseForm()
                for k, vv := range req.Form {
                        for _, v := range vv {
                                fmt.Fprintf(rw, "param-%s=%s\n", k, v)
                        }
                }
                for _, kv := range os.Environ() {
                        fmt.Fprintf(rw, "env-%s\n", kv)
                }
        }))
        os.Exit(0)
}