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49 lines
1.5 KiB
49 lines
1.5 KiB
/* |
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gochat - A dead simple real time webchat. |
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Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte) |
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This file is a part of gochat |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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function sha256(string) { |
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const encoded_string = new TextEncoder().encode(string); |
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return crypto.subtle.digest('SHA-256', encoded_string).then((hash_sum) => { |
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const hashArray = Array.from(new Uint8Array(hash_sum)); |
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const hashHex = hashArray |
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.map((bytes) => bytes.toString(16).padStart(2, '0')) |
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.join(''); |
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return hashHex; |
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}); |
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} |
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function to_hex_string(byteArr) { |
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return Array.from(byteArr, function(byte) { |
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return ('0' + (byte & 0xFF).toString(16).slice(-2)); |
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}).join('') |
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} |
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function is_image(filename) { |
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image_exts = ["jpe", "jpeg", "jpg", "png", "ppm", "gif"] |
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let is_img = false; |
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image_exts.find(ext => { |
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if (filename.includes(ext)) { |
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is_img = true; |
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return true; |
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} |
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}); |
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return is_img; |
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} |