forked from Mirrorlandia_minetest/minetest
Fix base64 validation and add unittests (#10515)
Implement proper padding character checks
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1bc753f655
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89f3991351
@ -910,7 +910,9 @@ Call these functions only at load time!
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* Example: `minetest.rgba(10, 20, 30, 40)`, returns `"#0A141E28"`
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* `minetest.encode_base64(string)`: returns string encoded in base64
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* Encodes a string in base64.
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* `minetest.decode_base64(string)`: returns string
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* `minetest.decode_base64(string)`: returns string or nil on failure
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* Padding characters are only supported starting at version 5.4.0, where
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5.5.0 and newer perform proper checks.
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* Decodes a string encoded in base64.
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* `minetest.gettext(string)` : returns string
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* look up the translation of a string in the gettext message catalog
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@ -5773,7 +5773,9 @@ Misc.
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* Example: `minetest.rgba(10, 20, 30, 40)`, returns `"#0A141E28"`
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* `minetest.encode_base64(string)`: returns string encoded in base64
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* Encodes a string in base64.
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* `minetest.decode_base64(string)`: returns string or nil for invalid base64
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* `minetest.decode_base64(string)`: returns string or nil on failure
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* Padding characters are only supported starting at version 5.4.0, where
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5.5.0 and newer perform proper checks.
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* Decodes a string encoded in base64.
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* `minetest.is_protected(pos, name)`: returns boolean
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* Returning `true` restricts the player `name` from modifying (i.e. digging,
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@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include "util/enriched_string.h"
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#include "util/numeric.h"
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#include "util/string.h"
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#include "util/base64.h"
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class TestUtilities : public TestBase {
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public:
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@ -56,6 +57,7 @@ public:
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void testMyround();
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void testStringJoin();
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void testEulerConversion();
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void testBase64();
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};
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static TestUtilities g_test_instance;
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@ -87,6 +89,7 @@ void TestUtilities::runTests(IGameDef *gamedef)
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TEST(testMyround);
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TEST(testStringJoin);
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TEST(testEulerConversion);
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TEST(testBase64);
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}
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////////////////////////////////////////////////////////////////////////////////
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@ -537,3 +540,93 @@ void TestUtilities::testEulerConversion()
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setPitchYawRoll(m2, v2);
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UASSERT(within(m1, m2, tolL));
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}
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void TestUtilities::testBase64()
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{
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// Test character set
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UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/") == true);
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UASSERT(base64_is_valid("/+9876543210"
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"zyxwvutsrqponmlkjihgfedcba"
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"ZYXWVUTSRQPONMLKJIHGFEDCBA") == true);
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UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+.") == false);
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UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789 /") == false);
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// Test empty string
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UASSERT(base64_is_valid("") == true);
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// Test different lengths, with and without padding,
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// with correct and incorrect padding
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UASSERT(base64_is_valid("A") == false);
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UASSERT(base64_is_valid("AA") == true);
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UASSERT(base64_is_valid("AAA") == true);
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UASSERT(base64_is_valid("AAAA") == true);
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UASSERT(base64_is_valid("AAAAA") == false);
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UASSERT(base64_is_valid("AAAAAA") == true);
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UASSERT(base64_is_valid("AAAAAAA") == true);
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UASSERT(base64_is_valid("AAAAAAAA") == true);
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UASSERT(base64_is_valid("A===") == false);
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UASSERT(base64_is_valid("AA==") == true);
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UASSERT(base64_is_valid("AAA=") == true);
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UASSERT(base64_is_valid("AAAA") == true);
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UASSERT(base64_is_valid("AAAA====") == false);
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UASSERT(base64_is_valid("AAAAA===") == false);
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UASSERT(base64_is_valid("AAAAAA==") == true);
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UASSERT(base64_is_valid("AAAAAAA=") == true);
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UASSERT(base64_is_valid("AAAAAAA==") == false);
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UASSERT(base64_is_valid("AAAAAAA===") == false);
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UASSERT(base64_is_valid("AAAAAAA====") == false);
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UASSERT(base64_is_valid("AAAAAAAA") == true);
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UASSERT(base64_is_valid("AAAAAAAA=") == false);
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UASSERT(base64_is_valid("AAAAAAAA==") == false);
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UASSERT(base64_is_valid("AAAAAAAA===") == false);
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UASSERT(base64_is_valid("AAAAAAAA====") == false);
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// Test if canonical encoding
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// Last character limitations, length % 4 == 3
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UASSERT(base64_is_valid("AAB") == false);
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UASSERT(base64_is_valid("AAE") == true);
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UASSERT(base64_is_valid("AAQ") == true);
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UASSERT(base64_is_valid("AAB=") == false);
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UASSERT(base64_is_valid("AAE=") == true);
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UASSERT(base64_is_valid("AAQ=") == true);
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UASSERT(base64_is_valid("AAAAAAB=") == false);
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UASSERT(base64_is_valid("AAAAAAE=") == true);
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UASSERT(base64_is_valid("AAAAAAQ=") == true);
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// Last character limitations, length % 4 == 2
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UASSERT(base64_is_valid("AB") == false);
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UASSERT(base64_is_valid("AE") == false);
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UASSERT(base64_is_valid("AQ") == true);
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UASSERT(base64_is_valid("AB==") == false);
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UASSERT(base64_is_valid("AE==") == false);
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UASSERT(base64_is_valid("AQ==") == true);
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UASSERT(base64_is_valid("AAAAAB==") == false);
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UASSERT(base64_is_valid("AAAAAE==") == false);
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UASSERT(base64_is_valid("AAAAAQ==") == true);
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// Extraneous character present
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UASSERT(base64_is_valid(".") == false);
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UASSERT(base64_is_valid("A.") == false);
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UASSERT(base64_is_valid("AA.") == false);
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UASSERT(base64_is_valid("AAA.") == false);
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UASSERT(base64_is_valid("AAAA.") == false);
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UASSERT(base64_is_valid("AAAAA.") == false);
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UASSERT(base64_is_valid("A.A") == false);
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UASSERT(base64_is_valid("AA.A") == false);
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UASSERT(base64_is_valid("AAA.A") == false);
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UASSERT(base64_is_valid("AAAA.A") == false);
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UASSERT(base64_is_valid("AAAAA.A") == false);
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UASSERT(base64_is_valid("\xE1""AAA") == false);
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// Padding in wrong position
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UASSERT(base64_is_valid("A=A") == false);
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UASSERT(base64_is_valid("AA=A") == false);
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UASSERT(base64_is_valid("AAA=A") == false);
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UASSERT(base64_is_valid("AAAA=A") == false);
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UASSERT(base64_is_valid("AAAAA=A") == false);
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}
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@ -33,18 +33,39 @@ static const std::string base64_chars =
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static const std::string base64_chars_padding_1 = "AEIMQUYcgkosw048";
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static const std::string base64_chars_padding_2 = "AQgw";
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static inline bool is_base64(unsigned char c)
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{
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return isalnum(c) || c == '+' || c == '/' || c == '=';
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return (c >= '0' && c <= '9')
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|| (c >= 'A' && c <= 'Z')
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|| (c >= 'a' && c <= 'z')
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|| c == '+' || c == '/';
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}
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bool base64_is_valid(std::string const& s)
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{
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for (char i : s)
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if (!is_base64(i))
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size_t i = 0;
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for (; i < s.size(); ++i)
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if (!is_base64(s[i]))
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break;
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unsigned char padding = 3 - ((i + 3) % 4);
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if ((padding == 1 && base64_chars_padding_1.find(s[i - 1]) == std::string::npos)
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|| (padding == 2 && base64_chars_padding_2.find(s[i - 1]) == std::string::npos)
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|| padding == 3)
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return false;
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int actual_padding = s.size() - i;
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// omission of padding characters is allowed
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if (actual_padding == 0)
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return true;
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// remaining characters (max. 2) may only be padding
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for (; i < s.size(); ++i)
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if (s[i] != '=')
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return false;
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return true;
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// number of padding characters needs to match
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return padding == actual_padding;
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}
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std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
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