code.gitea.io/gitea@v1.22.3/modules/charset/charset_test.go (about)

     1  // Copyright 2019 The Gitea Authors. All rights reserved.
     2  // SPDX-License-Identifier: MIT
     3  
     4  package charset
     5  
     6  import (
     7  	"bytes"
     8  	"io"
     9  	"strings"
    10  	"testing"
    11  
    12  	"code.gitea.io/gitea/modules/setting"
    13  
    14  	"github.com/stretchr/testify/assert"
    15  )
    16  
    17  func resetDefaultCharsetsOrder() {
    18  	defaultDetectedCharsetsOrder := make([]string, 0, len(setting.Repository.DetectedCharsetsOrder))
    19  	for _, charset := range setting.Repository.DetectedCharsetsOrder {
    20  		defaultDetectedCharsetsOrder = append(defaultDetectedCharsetsOrder, strings.ToLower(strings.TrimSpace(charset)))
    21  	}
    22  	setting.Repository.DetectedCharsetScore = map[string]int{}
    23  	i := 0
    24  	for _, charset := range defaultDetectedCharsetsOrder {
    25  		canonicalCharset := strings.ToLower(strings.TrimSpace(charset))
    26  		if _, has := setting.Repository.DetectedCharsetScore[canonicalCharset]; !has {
    27  			setting.Repository.DetectedCharsetScore[canonicalCharset] = i
    28  			i++
    29  		}
    30  	}
    31  }
    32  
    33  func TestMaybeRemoveBOM(t *testing.T) {
    34  	res := MaybeRemoveBOM([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
    35  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
    36  
    37  	res = MaybeRemoveBOM([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
    38  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
    39  }
    40  
    41  func TestToUTF8(t *testing.T) {
    42  	resetDefaultCharsetsOrder()
    43  	var res string
    44  	var err error
    45  
    46  	// Note: golang compiler seems so behave differently depending on the current
    47  	// locale, so some conversions might behave differently. For that reason, we don't
    48  	// depend on particular conversions but in expected behaviors.
    49  
    50  	res, err = ToUTF8([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
    51  	assert.NoError(t, err)
    52  	assert.Equal(t, "ABC", res)
    53  
    54  	// "áéíóú"
    55  	res, err = ToUTF8([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
    56  	assert.NoError(t, err)
    57  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, []byte(res))
    58  
    59  	// "áéíóú"
    60  	res, err = ToUTF8([]byte{
    61  		0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3,
    62  		0xc3, 0xba,
    63  	}, ConvertOpts{})
    64  	assert.NoError(t, err)
    65  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, []byte(res))
    66  
    67  	res, err = ToUTF8([]byte{
    68  		0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
    69  		0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
    70  	}, ConvertOpts{})
    71  	assert.NoError(t, err)
    72  	stringMustStartWith(t, "Hola,", res)
    73  	stringMustEndWith(t, "AAA.", res)
    74  
    75  	res, err = ToUTF8([]byte{
    76  		0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
    77  		0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
    78  	}, ConvertOpts{})
    79  	assert.NoError(t, err)
    80  	stringMustStartWith(t, "Hola,", res)
    81  	stringMustEndWith(t, "AAA.", res)
    82  
    83  	res, err = ToUTF8([]byte{
    84  		0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
    85  		0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
    86  	}, ConvertOpts{})
    87  	assert.NoError(t, err)
    88  	stringMustStartWith(t, "Hola,", res)
    89  	stringMustEndWith(t, "AAA.", res)
    90  
    91  	// Japanese (Shift-JIS)
    92  	// 日属秘ぞしちゅ。
    93  	res, err = ToUTF8([]byte{
    94  		0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82,
    95  		0xBF, 0x82, 0xE3, 0x81, 0x42,
    96  	}, ConvertOpts{})
    97  	assert.NoError(t, err)
    98  	assert.Equal(t, []byte{
    99  		0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
   100  		0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
   101  	},
   102  		[]byte(res))
   103  
   104  	res, err = ToUTF8([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
   105  	assert.NoError(t, err)
   106  	assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, []byte(res))
   107  }
   108  
   109  func TestToUTF8WithFallback(t *testing.T) {
   110  	resetDefaultCharsetsOrder()
   111  	// "ABC"
   112  	res := ToUTF8WithFallback([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
   113  	assert.Equal(t, []byte{0x41, 0x42, 0x43}, res)
   114  
   115  	// "áéíóú"
   116  	res = ToUTF8WithFallback([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
   117  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
   118  
   119  	// UTF8 BOM + "áéíóú"
   120  	res = ToUTF8WithFallback([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
   121  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
   122  
   123  	// "Hola, así cómo ños"
   124  	res = ToUTF8WithFallback([]byte{
   125  		0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
   126  		0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73,
   127  	}, ConvertOpts{})
   128  	assert.Equal(t, []byte{
   129  		0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63,
   130  		0xC3, 0xB3, 0x6D, 0x6F, 0x20, 0xC3, 0xB1, 0x6F, 0x73,
   131  	}, res)
   132  
   133  	// "Hola, así cómo "
   134  	minmatch := []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63, 0xC3, 0xB3, 0x6D, 0x6F, 0x20}
   135  
   136  	res = ToUTF8WithFallback([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73}, ConvertOpts{})
   137  	// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
   138  	assert.Equal(t, minmatch, res[0:len(minmatch)])
   139  
   140  	res = ToUTF8WithFallback([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73}, ConvertOpts{})
   141  	// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
   142  	assert.Equal(t, minmatch, res[0:len(minmatch)])
   143  
   144  	// Japanese (Shift-JIS)
   145  	// "日属秘ぞしちゅ。"
   146  	res = ToUTF8WithFallback([]byte{0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82, 0xBF, 0x82, 0xE3, 0x81, 0x42}, ConvertOpts{})
   147  	assert.Equal(t, []byte{
   148  		0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
   149  		0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
   150  	}, res)
   151  
   152  	res = ToUTF8WithFallback([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
   153  	assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, res)
   154  }
   155  
   156  func TestToUTF8DropErrors(t *testing.T) {
   157  	resetDefaultCharsetsOrder()
   158  	// "ABC"
   159  	res := ToUTF8DropErrors([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
   160  	assert.Equal(t, []byte{0x41, 0x42, 0x43}, res)
   161  
   162  	// "áéíóú"
   163  	res = ToUTF8DropErrors([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
   164  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
   165  
   166  	// UTF8 BOM + "áéíóú"
   167  	res = ToUTF8DropErrors([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
   168  	assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
   169  
   170  	// "Hola, así cómo ños"
   171  	res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73}, ConvertOpts{})
   172  	assert.Equal(t, []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73}, res[:8])
   173  	assert.Equal(t, []byte{0x73}, res[len(res)-1:])
   174  
   175  	// "Hola, así cómo "
   176  	minmatch := []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63, 0xC3, 0xB3, 0x6D, 0x6F, 0x20}
   177  
   178  	res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73}, ConvertOpts{})
   179  	// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
   180  	assert.Equal(t, minmatch, res[0:len(minmatch)])
   181  
   182  	res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73}, ConvertOpts{})
   183  	// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
   184  	assert.Equal(t, minmatch, res[0:len(minmatch)])
   185  
   186  	// Japanese (Shift-JIS)
   187  	// "日属秘ぞしちゅ。"
   188  	res = ToUTF8DropErrors([]byte{0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82, 0xBF, 0x82, 0xE3, 0x81, 0x42}, ConvertOpts{})
   189  	assert.Equal(t, []byte{
   190  		0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
   191  		0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
   192  	}, res)
   193  
   194  	res = ToUTF8DropErrors([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
   195  	assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, res)
   196  }
   197  
   198  func TestDetectEncoding(t *testing.T) {
   199  	resetDefaultCharsetsOrder()
   200  	testSuccess := func(b []byte, expected string) {
   201  		encoding, err := DetectEncoding(b)
   202  		assert.NoError(t, err)
   203  		assert.Equal(t, expected, encoding)
   204  	}
   205  	// utf-8
   206  	b := []byte("just some ascii")
   207  	testSuccess(b, "UTF-8")
   208  
   209  	// utf-8-sig: "hey" (with BOM)
   210  	b = []byte{0xef, 0xbb, 0xbf, 0x68, 0x65, 0x79}
   211  	testSuccess(b, "UTF-8")
   212  
   213  	// utf-16: "hey<accented G>"
   214  	b = []byte{0xff, 0xfe, 0x68, 0x00, 0x65, 0x00, 0x79, 0x00, 0xf4, 0x01}
   215  	testSuccess(b, "UTF-16LE")
   216  
   217  	// iso-8859-1: d<accented e>cor<newline>
   218  	b = []byte{0x44, 0xe9, 0x63, 0x6f, 0x72, 0x0a}
   219  	encoding, err := DetectEncoding(b)
   220  	assert.NoError(t, err)
   221  	assert.Contains(t, encoding, "ISO-8859-1")
   222  
   223  	old := setting.Repository.AnsiCharset
   224  	setting.Repository.AnsiCharset = "placeholder"
   225  	defer func() {
   226  		setting.Repository.AnsiCharset = old
   227  	}()
   228  	testSuccess(b, "placeholder")
   229  
   230  	// invalid bytes
   231  	b = []byte{0xfa}
   232  	_, err = DetectEncoding(b)
   233  	assert.Error(t, err)
   234  }
   235  
   236  func stringMustStartWith(t *testing.T, expected, value string) {
   237  	assert.Equal(t, expected, value[:len(expected)])
   238  }
   239  
   240  func stringMustEndWith(t *testing.T, expected, value string) {
   241  	assert.Equal(t, expected, value[len(value)-len(expected):])
   242  }
   243  
   244  func TestToUTF8WithFallbackReader(t *testing.T) {
   245  	resetDefaultCharsetsOrder()
   246  
   247  	for testLen := 0; testLen < 2048; testLen++ {
   248  		pattern := "    test { () }\n"
   249  		input := ""
   250  		for len(input) < testLen {
   251  			input += pattern
   252  		}
   253  		input = input[:testLen]
   254  		input += "// Выключаем"
   255  		rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)), ConvertOpts{})
   256  		r, _ := io.ReadAll(rd)
   257  		assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
   258  	}
   259  
   260  	truncatedOneByteExtension := failFastBytes
   261  	encoding, _ := DetectEncoding(truncatedOneByteExtension)
   262  	assert.Equal(t, "UTF-8", encoding)
   263  
   264  	truncatedTwoByteExtension := failFastBytes
   265  	truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
   266  	truncatedTwoByteExtension[len(failFastBytes)-2] = 0xe2
   267  
   268  	encoding, _ = DetectEncoding(truncatedTwoByteExtension)
   269  	assert.Equal(t, "UTF-8", encoding)
   270  
   271  	truncatedThreeByteExtension := failFastBytes
   272  	truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
   273  	truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
   274  	truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0
   275  
   276  	encoding, _ = DetectEncoding(truncatedThreeByteExtension)
   277  	assert.Equal(t, "UTF-8", encoding)
   278  }
   279  
   280  var failFastBytes = []byte{
   281  	0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67, 0x2e, 0x61, 0x70, 0x61, 0x63, 0x68, 0x65, 0x2e, 0x74, 0x6f,
   282  	0x6f, 0x6c, 0x73, 0x2e, 0x61, 0x6e, 0x74, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x63, 0x6f, 0x6e,
   283  	0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x73, 0x0a, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67,
   284  	0x2e, 0x73, 0x70, 0x72, 0x69, 0x6e, 0x67, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x77, 0x6f, 0x72, 0x6b, 0x2e, 0x62, 0x6f, 0x6f,
   285  	0x74, 0x2e, 0x67, 0x72, 0x61, 0x64, 0x6c, 0x65, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x73, 0x2e, 0x72, 0x75, 0x6e, 0x2e, 0x42,
   286  	0x6f, 0x6f, 0x74, 0x52, 0x75, 0x6e, 0x0a, 0x0a, 0x70, 0x6c, 0x75, 0x67, 0x69, 0x6e, 0x73, 0x20, 0x7b, 0x0a, 0x20, 0x20,
   287  	0x20, 0x20, 0x69, 0x64, 0x28, 0x22, 0x6f, 0x72, 0x67, 0x2e, 0x73, 0x70, 0x72, 0x69, 0x6e, 0x67, 0x66, 0x72, 0x61, 0x6d,
   288  	0x65, 0x77, 0x6f, 0x72, 0x6b, 0x2e, 0x62, 0x6f, 0x6f, 0x74, 0x22, 0x29, 0x0a, 0x7d, 0x0a, 0x0a, 0x64, 0x65, 0x70, 0x65,
   289  	0x6e, 0x64, 0x65, 0x6e, 0x63, 0x69, 0x65, 0x73, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6d, 0x70, 0x6c, 0x65,
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