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Move image manipulation tests to its external package #579

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Dec 20, 2024
Merged

Move image manipulation tests to its external package #579

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171 changes: 171 additions & 0 deletions ext/image/image_test.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,171 @@
package goproxy_image_test

import (
"bytes"
"crypto/tls"
"github.com/elazarl/goproxy"
goproxy_image "github.com/elazarl/goproxy/ext/image"
"image"
"io"
"net/http"
"net/http/httptest"
"net/url"
"os"
"testing"
)

var acceptAllCerts = &tls.Config{InsecureSkipVerify: true}

func oneShotProxy(proxy *goproxy.ProxyHttpServer, t *testing.T) (client *http.Client, s *httptest.Server) {
s = httptest.NewServer(proxy)

proxyUrl, _ := url.Parse(s.URL)
tr := &http.Transport{TLSClientConfig: acceptAllCerts, Proxy: http.ProxyURL(proxyUrl)}
client = &http.Client{Transport: tr}
return
}

func getImage(file string, t *testing.T) image.Image {
newimage, err := os.ReadFile(file)
if err != nil {
t.Fatal("Cannot read file", file, err)
}
img, _, err := image.Decode(bytes.NewReader(newimage))
if err != nil {
t.Fatal("Cannot decode image", file, err)
}
return img
}

func compareImage(eImg, aImg image.Image, t *testing.T) {
if eImg.Bounds().Dx() != aImg.Bounds().Dx() || eImg.Bounds().Dy() != aImg.Bounds().Dy() {
t.Error("image sizes different")
return
}
for i := 0; i < eImg.Bounds().Dx(); i++ {
for j := 0; j < eImg.Bounds().Dy(); j++ {
er, eg, eb, ea := eImg.At(i, j).RGBA()
ar, ag, ab, aa := aImg.At(i, j).RGBA()
if er != ar || eg != ag || eb != ab || ea != aa {
t.Error("images different at", i, j, "vals\n", er, eg, eb, ea, "\n", ar, ag, ab, aa, aa)
return
}
}
}
}

var fs = httptest.NewServer(http.FileServer(http.Dir(".")))

func localFile(url string) string { return fs.URL + "/" + url }

func TestConstantImageHandler(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()
football := getImage("test_data/football.png", t)
proxy.OnResponse().Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

resp, err := client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err := image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}
}

func TestImageHandler(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()
football := getImage("test_data/football.png", t)

proxy.OnResponse(goproxy.UrlIs("/test_data/panda.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

resp, err := client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err := image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}

// and again
resp, err = client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err = image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}
}

func fatalOnErr(err error, msg string, t *testing.T) {
if err != nil {
t.Fatal(msg, err)
}
}

func get(url string, client *http.Client) ([]byte, error) {
resp, err := client.Get(url)
if err != nil {
return nil, err
}
txt, err := io.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return nil, err
}
return txt, nil
}

func getOrFail(url string, client *http.Client, t *testing.T) []byte {
txt, err := get(url, client)
if err != nil {
t.Fatal("Can't fetch url", url, err)
}
return txt
}

func TestReplaceImage(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()

panda := getImage("test_data/panda.png", t)
football := getImage("test_data/football.png", t)

proxy.OnResponse(goproxy.UrlIs("/test_data/panda.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))
proxy.OnResponse(goproxy.UrlIs("/test_data/football.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return panda
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

imgByPandaReq, _, err := image.Decode(bytes.NewReader(getOrFail(localFile("test_data/panda.png"), client, t)))
fatalOnErr(err, "decode panda", t)
compareImage(football, imgByPandaReq, t)

imgByFootballReq, _, err := image.Decode(bytes.NewReader(getOrFail(localFile("test_data/football.png"), client, t)))
fatalOnErr(err, "decode football", t)
compareImage(panda, imgByFootballReq, t)
}
5 changes: 1 addition & 4 deletions go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,6 @@ module github.com/elazarl/goproxy

go 1.20

require (
github.com/elazarl/goproxy/ext v0.0.0-20241217120900-7711dfa3811c
golang.org/x/net v0.33.0
)
require golang.org/x/net v0.33.0

require golang.org/x/text v0.21.0 // indirect
5 changes: 0 additions & 5 deletions go.sum
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Original file line number Diff line number Diff line change
@@ -1,8 +1,3 @@
github.com/elazarl/goproxy/ext v0.0.0-20241217120900-7711dfa3811c h1:R+i10jtNSzKJKqEZAYJnR9M8y14k0zrNHqD1xkv/A2M=
github.com/elazarl/goproxy/ext v0.0.0-20241217120900-7711dfa3811c/go.mod h1:gNh8nYJoAm43RfaxurUnxr+N1PwuFV3ZMl/efxlIlY8=
github.com/rogpeppe/go-charset v0.0.0-20180617210344-2471d30d28b4/go.mod h1:qgYeAmZ5ZIpBWTGllZSQnw97Dj+woV0toclVaRGI8pc=
golang.org/x/net v0.32.0 h1:ZqPmj8Kzc+Y6e0+skZsuACbx+wzMgo5MQsJh9Qd6aYI=
golang.org/x/net v0.32.0/go.mod h1:CwU0IoeOlnQQWJ6ioyFrfRuomB8GKF6KbYXZVyeXNfs=
golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
Expand Down
116 changes: 0 additions & 116 deletions proxy_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@ import (
"crypto/x509"
"encoding/base64"
"fmt"
"image"
"io"
"net"
"net/http"
Expand All @@ -22,7 +21,6 @@ import (
"time"

"github.com/elazarl/goproxy"
goproxy_image "github.com/elazarl/goproxy/ext/image"
)

var acceptAllCerts = &tls.Config{InsecureSkipVerify: true}
Expand Down Expand Up @@ -221,18 +219,6 @@ func TestContentType(t *testing.T) {
}
}

func getImage(file string, t *testing.T) image.Image {
newimage, err := os.ReadFile(file)
if err != nil {
t.Fatal("Cannot read file", file, err)
}
img, _, err := image.Decode(bytes.NewReader(newimage))
if err != nil {
t.Fatal("Cannot decode image", file, err)
}
return img
}

func readAll(r io.Reader, t *testing.T) []byte {
b, err := io.ReadAll(r)
if err != nil {
Expand All @@ -259,84 +245,6 @@ func panicOnErr(err error, msg string) {
}
}

func compareImage(eImg, aImg image.Image, t *testing.T) {
if eImg.Bounds().Dx() != aImg.Bounds().Dx() || eImg.Bounds().Dy() != aImg.Bounds().Dy() {
t.Error("image sizes different")
return
}
for i := 0; i < eImg.Bounds().Dx(); i++ {
for j := 0; j < eImg.Bounds().Dy(); j++ {
er, eg, eb, ea := eImg.At(i, j).RGBA()
ar, ag, ab, aa := aImg.At(i, j).RGBA()
if er != ar || eg != ag || eb != ab || ea != aa {
t.Error("images different at", i, j, "vals\n", er, eg, eb, ea, "\n", ar, ag, ab, aa, aa)
return
}
}
}
}

func TestConstantImageHandler(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()
//panda := getImage("panda.png", t)
football := getImage("test_data/football.png", t)
proxy.OnResponse().Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

resp, err := client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err := image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}
}

func TestImageHandler(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()
football := getImage("test_data/football.png", t)

proxy.OnResponse(goproxy.UrlIs("/test_data/panda.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

resp, err := client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err := image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}

// and again
resp, err = client.Get(localFile("test_data/panda.png"))
if err != nil {
t.Fatal("Cannot get panda.png", err)
}

img, _, err = image.Decode(resp.Body)
if err != nil {
t.Error("decode", err)
} else {
compareImage(football, img, t)
}
}

func TestChangeResp(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()
proxy.OnResponse().DoFunc(func(resp *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
Expand All @@ -358,30 +266,6 @@ func TestChangeResp(t *testing.T) {
t.Fatal(err)
}
}
func TestReplaceImage(t *testing.T) {
proxy := goproxy.NewProxyHttpServer()

panda := getImage("test_data/panda.png", t)
football := getImage("test_data/football.png", t)

proxy.OnResponse(goproxy.UrlIs("/test_data/panda.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return football
}))
proxy.OnResponse(goproxy.UrlIs("/test_data/football.png")).Do(goproxy_image.HandleImage(func(img image.Image, ctx *goproxy.ProxyCtx) image.Image {
return panda
}))

client, l := oneShotProxy(proxy, t)
defer l.Close()

imgByPandaReq, _, err := image.Decode(bytes.NewReader(getOrFail(localFile("test_data/panda.png"), client, t)))
fatalOnErr(err, "decode panda", t)
compareImage(football, imgByPandaReq, t)

imgByFootballReq, _, err := image.Decode(bytes.NewReader(getOrFail(localFile("test_data/football.png"), client, t)))
fatalOnErr(err, "decode football", t)
compareImage(panda, imgByFootballReq, t)
}

func getCert(c *tls.Conn, t *testing.T) []byte {
if err := c.Handshake(); err != nil {
Expand Down
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