1 |
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2 | const { svg2png } = require('../common/svg2png')
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3 | const { signSvg } = require('./swu-sign-svg');
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4 | const fs = require('fs');
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5 |
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6 | /**
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7 | * Function that creates a binary PNG image from an SWU sign with an optional style string
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8 | * @function swu.signPng
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9 | * @param {string} swuSign - an SWU sign with optional style string
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10 | * @returns {ArrayBuffer} sign png
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11 | * @example
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12 | * // using promise.then
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13 | * swu.signPng('𝠃𝤟𝤩𝣵𝤐𝤇𝣤𝤐𝤆𝣮𝣭').then( png => {
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14 | * console.log(png)
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15 | * })
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16 | * @example
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17 | * // using async/await
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18 | * const png = await swu.signPng('𝠃𝤟𝤩𝣵𝤐𝤇𝣤𝤐𝤆𝣮𝣭')
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19 | */
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20 | const signPng = async (swuSign) => {
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21 | let svg = await signSvg(swuSign);
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22 | svg = svg.replace(/<text.*text>/g, "");
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23 | const png = await svg2png(svg);
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24 | return png;
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25 | }
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26 |
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27 | /**
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28 | * Function that creates a data url PNG image from an SWU sign with an optional style string
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29 | * @function swu.signPngDataUrl
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30 | * @param {string} swuSign - an SWU sign with optional style string
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31 | * @returns {string} sign png
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32 | * @example
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33 | * // using promise.then
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34 | * swu.signPngDataUrl('𝠃𝤟𝤩𝣵𝤐𝤇𝣤𝤐𝤆𝣮𝣭').then( png => {
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35 | * console.log(png)
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36 | * })
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37 | * @example
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38 | * // using async/await
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39 | * const png = await swu.signPngDataUrl('𝠃𝤟𝤩𝣵𝤐𝤇𝣤𝤐𝤆𝣮𝣭')
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40 | */
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41 | const signPngDataUrl = async (swuSign) => {
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42 | const res = await signPng(swuSign);
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43 | return 'data:image/png;base64,' + res.toString('base64');
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44 | }
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45 |
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46 | if (require.main === module) {
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47 | if (process.argv[3]) {
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48 | signPng(process.argv[2]).then( res => {
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49 | fs.writeFileSync(process.argv[3], res);
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50 | })
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51 | } else {
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52 | signPngDataUrl(process.argv[2]).then( res => {
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53 | console.log(res)
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54 | })
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55 | }
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56 | } else {
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57 | module.exports = { signPng, signPngDataUrl }
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58 | }
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