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// Copyright 2009 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.

package http_test

import (
        "bytes"
        "fmt"
        "io"
        "io/ioutil"
        "mime/multipart"
        . "net/http"
        "net/http/httptest"
        "net/url"
        "os"
        "reflect"
        "regexp"
        "strings"
        "testing"
)

func TestQuery(t *testing.T) {
        req := &Request{Method: "GET"}
        req.URL, _ = url.Parse("http://www.google.com/search?q=foo&q=bar")
        if q := req.FormValue("q"); q != "foo" {
                t.Errorf(`req.FormValue("q") = %q, want "foo"`, q)
        }
}

func TestPostQuery(t *testing.T) {
        req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x",
                strings.NewReader("z=post&both=y"))
        req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")

        if q := req.FormValue("q"); q != "foo" {
                t.Errorf(`req.FormValue("q") = %q, want "foo"`, q)
        }
        if z := req.FormValue("z"); z != "post" {
                t.Errorf(`req.FormValue("z") = %q, want "post"`, z)
        }
        if both := req.Form["both"]; !reflect.DeepEqual(both, []string{"x", "y"}) {
                t.Errorf(`req.FormValue("both") = %q, want ["x", "y"]`, both)
        }
}

type stringMap map[string][]string
type parseContentTypeTest struct {
        shouldError bool
        contentType stringMap
}

var parseContentTypeTests = []parseContentTypeTest{
        {false, stringMap{"Content-Type": {"text/plain"}}},
        // Non-existent keys are not placed. The value nil is illegal.
        {true, stringMap{}},
        {true, stringMap{"Content-Type": {"text/plain; boundary="}}},
        {false, stringMap{"Content-Type": {"application/unknown"}}},
}

func TestParseFormUnknownContentType(t *testing.T) {
        for i, test := range parseContentTypeTests {
                req := &Request{
                        Method: "POST",
                        Header: Header(test.contentType),
                        Body:   ioutil.NopCloser(bytes.NewBufferString("body")),
                }
                err := req.ParseForm()
                switch {
                case err == nil && test.shouldError:
                        t.Errorf("test %d should have returned error", i)
                case err != nil && !test.shouldError:
                        t.Errorf("test %d should not have returned error, got %v", i, err)
                }
        }
}

func TestMultipartReader(t *testing.T) {
        req := &Request{
                Method: "POST",
                Header: Header{"Content-Type": {`multipart/form-data; boundary="foo123"`}},
                Body:   ioutil.NopCloser(new(bytes.Buffer)),
        }
        multipart, err := req.MultipartReader()
        if multipart == nil {
                t.Errorf("expected multipart; error: %v", err)
        }

        req.Header = Header{"Content-Type": {"text/plain"}}
        multipart, err = req.MultipartReader()
        if multipart != nil {
                t.Errorf("unexpected multipart for text/plain")
        }
}

func TestRedirect(t *testing.T) {
        ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
                switch r.URL.Path {
                case "/":
                        w.Header().Set("Location", "/foo/")
                        w.WriteHeader(StatusSeeOther)
                case "/foo/":
                        fmt.Fprintf(w, "foo")
                default:
                        w.WriteHeader(StatusBadRequest)
                }
        }))
        defer ts.Close()

        var end = regexp.MustCompile("/foo/$")
        r, err := Get(ts.URL)
        if err != nil {
                t.Fatal(err)
        }
        r.Body.Close()
        url := r.Request.URL.String()
        if r.StatusCode != 200 || !end.MatchString(url) {
                t.Fatalf("Get got status %d at %q, want 200 matching /foo/$", r.StatusCode, url)
        }
}

func TestSetBasicAuth(t *testing.T) {
        r, _ := NewRequest("GET", "http://example.com/", nil)
        r.SetBasicAuth("Aladdin", "open sesame")
        if g, e := r.Header.Get("Authorization"), "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ=="; g != e {
                t.Errorf("got header %q, want %q", g, e)
        }
}

func TestMultipartRequest(t *testing.T) {
        // Test that we can read the values and files of a 
        // multipart request with FormValue and FormFile,
        // and that ParseMultipartForm can be called multiple times.
        req := newTestMultipartRequest(t)
        if err := req.ParseMultipartForm(25); err != nil {
                t.Fatal("ParseMultipartForm first call:", err)
        }
        defer req.MultipartForm.RemoveAll()
        validateTestMultipartContents(t, req, false)
        if err := req.ParseMultipartForm(25); err != nil {
                t.Fatal("ParseMultipartForm second call:", err)
        }
        validateTestMultipartContents(t, req, false)
}

func TestMultipartRequestAuto(t *testing.T) {
        // Test that FormValue and FormFile automatically invoke
        // ParseMultipartForm and return the right values.
        req := newTestMultipartRequest(t)
        defer func() {
                if req.MultipartForm != nil {
                        req.MultipartForm.RemoveAll()
                }
        }()
        validateTestMultipartContents(t, req, true)
}

func TestEmptyMultipartRequest(t *testing.T) {
        // Test that FormValue and FormFile automatically invoke
        // ParseMultipartForm and return the right values.
        req, err := NewRequest("GET", "/", nil)
        if err != nil {
                t.Errorf("NewRequest err = %q", err)
        }
        testMissingFile(t, req)
}

func TestRequestMultipartCallOrder(t *testing.T) {
        req := newTestMultipartRequest(t)
        _, err := req.MultipartReader()
        if err != nil {
                t.Fatalf("MultipartReader: %v", err)
        }
        err = req.ParseMultipartForm(1024)
        if err == nil {
                t.Errorf("expected an error from ParseMultipartForm after call to MultipartReader")
        }
}

func testMissingFile(t *testing.T, req *Request) {
        f, fh, err := req.FormFile("missing")
        if f != nil {
                t.Errorf("FormFile file = %q, want nil", f)
        }
        if fh != nil {
                t.Errorf("FormFile file header = %q, want nil", fh)
        }
        if err != ErrMissingFile {
                t.Errorf("FormFile err = %q, want ErrMissingFile", err)
        }
}

func newTestMultipartRequest(t *testing.T) *Request {
        b := bytes.NewBufferString(strings.Replace(message, "\n", "\r\n", -1))
        req, err := NewRequest("POST", "/", b)
        if err != nil {
                t.Fatal("NewRequest:", err)
        }
        ctype := fmt.Sprintf(`multipart/form-data; boundary="%s"`, boundary)
        req.Header.Set("Content-type", ctype)
        return req
}

func validateTestMultipartContents(t *testing.T, req *Request, allMem bool) {
        if g, e := req.FormValue("texta"), textaValue; g != e {
                t.Errorf("texta value = %q, want %q", g, e)
        }
        if g, e := req.FormValue("textb"), textbValue; g != e {
                t.Errorf("textb value = %q, want %q", g, e)
        }
        if g := req.FormValue("missing"); g != "" {
                t.Errorf("missing value = %q, want empty string", g)
        }

        assertMem := func(n string, fd multipart.File) {
                if _, ok := fd.(*os.File); ok {
                        t.Error(n, " is *os.File, should not be")
                }
        }
        fda := testMultipartFile(t, req, "filea", "filea.txt", fileaContents)
        defer fda.Close()
        assertMem("filea", fda)
        fdb := testMultipartFile(t, req, "fileb", "fileb.txt", filebContents)
        defer fdb.Close()
        if allMem {
                assertMem("fileb", fdb)
        } else {
                if _, ok := fdb.(*os.File); !ok {
                        t.Errorf("fileb has unexpected underlying type %T", fdb)
                }
        }

        testMissingFile(t, req)
}

func testMultipartFile(t *testing.T, req *Request, key, expectFilename, expectContent string) multipart.File {
        f, fh, err := req.FormFile(key)
        if err != nil {
                t.Fatalf("FormFile(%q): %q", key, err)
        }
        if fh.Filename != expectFilename {
                t.Errorf("filename = %q, want %q", fh.Filename, expectFilename)
        }
        var b bytes.Buffer
        _, err = io.Copy(&b, f)
        if err != nil {
                t.Fatal("copying contents:", err)
        }
        if g := b.String(); g != expectContent {
                t.Errorf("contents = %q, want %q", g, expectContent)
        }
        return f
}

const (
        fileaContents = "This is a test file."
        filebContents = "Another test file."
        textaValue    = "foo"
        textbValue    = "bar"
        boundary      = `MyBoundary`
)

const message = `
--MyBoundary
Content-Disposition: form-data; name="filea"; filename="filea.txt"
Content-Type: text/plain

` + fileaContents + `
--MyBoundary
Content-Disposition: form-data; name="fileb"; filename="fileb.txt"
Content-Type: text/plain

` + filebContents + `
--MyBoundary
Content-Disposition: form-data; name="texta"

` + textaValue + `
--MyBoundary
Content-Disposition: form-data; name="textb"

` + textbValue + `
--MyBoundary--
`