damus.io

damus.io website
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util.js (16206B)


      1 
      2 function log_error(fmt, ...args) {
      3 	console.error(fmt, ...args)
      4 }
      5 
      6 function log_debug(fmt, ...args) {
      7 	console.debug(fmt, ...args)
      8 }
      9 
     10 /* find_node is a short name for document.querySelector, it also takes in a 
     11  * parent element to search on.
     12  */
     13 function find_node(selector, parentEl) {
     14 	const el = parentEl ? parentEl : document;
     15 	return el.querySelector(selector)
     16 }
     17 
     18 /* find_nodes is a short name for document.querySelectorAll, it also takes in a
     19  * parent element to search on.
     20  */
     21 function find_nodes(selector, parentEl) {
     22 	const el = parentEl ? parentEl : document;
     23 	return el.querySelectorAll(selector)
     24 }
     25 
     26 /* uuidv4 returns a new uuid v4
     27  */
     28 function uuidv4() {
     29   return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
     30     (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
     31   );
     32 }
     33 
     34 function bech32_decode(pubkey) {
     35 	const decoded = bech32.decode(pubkey)
     36 	const bytes = fromWords(decoded.words)
     37 	return nostrjs.hex_encode(bytes)
     38 }
     39 
     40 function get_since_time(created_at) {
     41 	if (created_at == null) 
     42 		return null
     43 	return created_at - 60 * 10
     44 }
     45 
     46 function zero_bits(b) {
     47 	let n = 0;
     48 	if (b == 0) return 8;
     49 	while (b >>= 1) {
     50 		n++;
     51 	}
     52 	return 7-n;
     53 }
     54 
     55 function leading_zero_bits(id) {
     56 	const buf = nostrjs.hex_decode(id)
     57 	let i
     58 	for (i = 0, total = 0; i < 32; i++) {
     59 		bits = zero_bits(buf[i])
     60 		total += bits
     61 		if (bits != 8) {
     62 			break
     63 		}
     64 	}
     65 	return total
     66 }
     67 
     68 /* min returns the minimum value of a or b
     69  */
     70 function min(a, b) {
     71 	return a < b ? a : b;
     72 }
     73 
     74 function difficulty_to_prefix(d) {
     75 	const n = Math.floor(d / 4)
     76 	let s = ""
     77 	for (i = 0; i < n; i++) {
     78 		s += "0"
     79 	}
     80 	return s
     81 }
     82 
     83 function calculate_pow(ev) {
     84 	const id_bits = leading_zero_bits(ev.id)
     85 	for (const tag of ev.tags) {
     86 		if (tag.length >= 3 && tag[0] === "nonce") {
     87 			const target = +tag[2]
     88 			if (isNaN(target))
     89 				return 0
     90 
     91 			// if our nonce target is smaller than the difficulty,
     92 			// then we use the nonce target as the actual difficulty
     93 			return min(target, id_bits)
     94 		}
     95 	}
     96 
     97 	// not a valid pow if we don't have a difficulty target
     98 	return 0
     99 }
    100 
    101 /* can_reply returns a boolean value based on if you can "reply" to the event
    102  * in the manner of a chat.
    103  */
    104 function can_reply(ev) {
    105 	return ev.kind === 1 || ev.kind === 42
    106 }
    107 
    108 function should_add_to_timeline(ev) {
    109 	// TODO rename should_add_to_timeline to is_timeline_event
    110 	return ev.kind === 1 || ev.kind === 42 || ev.kind === 6
    111 }
    112 
    113 /* time_delta returns a string of the time of current since previous.
    114  */
    115 function time_delta(current, previous) {
    116     var msPerMinute = 60 * 1000;
    117     var msPerHour = msPerMinute * 60;
    118     var msPerDay = msPerHour * 24;
    119     var msPerMonth = msPerDay * 30;
    120     var msPerYear = msPerDay * 365;
    121     var elapsed = current - previous;
    122 
    123     if (elapsed < msPerMinute) {
    124          return Math.round(elapsed/1000) + ' seconds ago';
    125     }
    126     else if (elapsed < msPerHour) {
    127          return Math.round(elapsed/msPerMinute) + ' minutes ago';
    128     }
    129     else if (elapsed < msPerDay ) {
    130          return Math.round(elapsed/msPerHour ) + ' hours ago';
    131     }
    132     else if (elapsed < msPerMonth) {
    133         return Math.round(elapsed/msPerDay) + ' days ago';
    134     }
    135     else if (elapsed < msPerYear) {
    136         return Math.round(elapsed/msPerMonth) + ' months ago';
    137     }
    138     else {
    139         return Math.round(elapsed/msPerYear ) + ' years ago';
    140     }
    141 }
    142 
    143 function is_valid_reaction_content(content) {
    144 	return content === "+" || content === "" || is_emoji(content)
    145 }
    146 
    147 function get_reaction_emoji(ev) {
    148 	if (ev.content === "+" || ev.content === "") {
    149 		return "❤️";
    150 	}
    151 	return ev.content
    152 }
    153 
    154 const IMG_REGEX = /(png|jpeg|jpg|gif|webp)$/i
    155 function is_img_url(path) {
    156 	return IMG_REGEX.test(path)
    157 }
    158 
    159 const VID_REGEX = /(webm|mp4)$/i
    160 function is_video_url(path) {
    161 	return VID_REGEX.test(path)
    162 }
    163 
    164 const URL_REGEX = /(^|\s)(https?:\/\/[^\s]+)[,:)]?(\w|$)/g;
    165 function linkify(text, show_media) {
    166 	return text.replace(URL_REGEX, function(match, p1, p2, p3) {
    167 		const url = p2+p3
    168 		const parsed = new URL(url)
    169 		let markup;
    170 		if (show_media && is_img_url(parsed.pathname)) {
    171 			markup = html`
    172 			<a target="_blank" href="${url}">
    173 				<img class="inline-img" src="${url}"/>
    174 			</a>
    175 			`;
    176 		} else if (show_media && is_video_url(parsed.pathname)) {
    177 			markup = html`
    178 			<video controls class="inline-img" />
    179 			  <source src="${url}">
    180 			</video>
    181 			`;
    182 		} else {
    183 			markup = html`<a target="_blank" rel="noopener noreferrer" href="${url}">${url}</a>`;
    184 		}
    185 		return p1+markup;
    186 	})
    187 }
    188 
    189 const WORD_REGEX=/\w/
    190 function is_emoji(str) {
    191 	return !WORD_REGEX.test(str) && REACTION_REGEX.test(str)
    192 }
    193 
    194 const REACTION_REGEX = 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83E\uDDD1\uD83C[\uDFFB-\uDFFF])))?|\uDFFC(?:\u200D(?:[\u2695\u2696\u2708]\uFE0F?|\u2764\uFE0F?\u200D(?:\uD83D\uDC8B\u200D)?\uD83E\uDDD1\uD83C[\uDFFB\uDFFD-\uDFFF]|\uD83C[\uDF3E\uDF73\uDF7C\uDF84\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E(?:[\uDDAF-\uDDB3\uDDBC\uDDBD]|\uDD1D\u200D\uD83E\uDDD1\uD83C[\uDFFB-\uDFFF])))?|\uDFFD(?:\u200D(?:[\u2695\u2696\u2708]\uFE0F?|\u2764\uFE0F?\u200D(?:\uD83D\uDC8B\u200D)?\uD83E\uDDD1\uD83C[\uDFFB\uDFFC\uDFFE\uDFFF]|\uD83C[\uDF3E\uDF73\uDF7C\uDF84\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E(?:[\uDDAF-\uDDB3\uDDBC\uDDBD]|\uDD1D\u200D\uD83E\uDDD1\uD83C[\uDFFB-\uDFFF])))?|\uDFFE(?:\u200D(?:[\u2695\u2696\u2708]\uFE0F?|\u2764\uFE0F?\u200D(?:\uD83D\uDC8B\u200D)?\uD83E\uDDD1\uD83C[\uDFFB-\uDFFD\uDFFF]|\uD83C[\uDF3E\uDF73\uDF7C\uDF84\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E(?:[\uDDAF-\uDDB3\uDDBC\uDDBD]|\uDD1D\u200D\uD83E\uDDD1\uD83C[\uDFFB-\uDFFF])))?|\uDFFF(?:\u200D(?:[\u2695\u2696\u2708]\uFE0F?|\u2764\uFE0F?\u200D(?:\uD83D\uDC8B\u200D)?\uD83E\uDDD1\uD83C[\uDFFB-\uDFFE]|\uD83C[\uDF3E\uDF73\uDF7C\uDF84\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E(?:[\uDDAF-\uDDB3\uDDBC\uDDBD]|\uDD1D\u200D\uD83E\uDDD1\uD83C[\uDFFB-\uDFFF])))?))?|\uDEF1(?:\uD83C(?:\uDFFB(?:\u200D\uD83E\uDEF2\uD83C[\uDFFC-\uDFFF])?|\uDFFC(?:\u200D\uD83E\uDEF2\uD83C[\uDFFB\uDFFD-\uDFFF])?|\uDFFD(?:\u200D\uD83E\uDEF2\uD83C[\uDFFB\uDFFC\uDFFE\uDFFF])?|\uDFFE(?:\u200D\uD83E\uDEF2\uD83C[\uDFFB-\uDFFD\uDFFF])?|\uDFFF(?:\u200D\uD83E\uDEF2\uD83C[\uDFFB-\uDFFE])?))?)$/
    195