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added HtmlToEntities and HtmlText.Escape

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Wizou 2022-01-12 02:54:59 +01:00
parent 0dffccc047
commit c93481189a
2 changed files with 107 additions and 3 deletions
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13
EXAMPLES.md
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@ -37,16 +37,25 @@ if (contacts.imported.Length > 0)
*Note: To prevent spam, Telegram may restrict your ability to add new phone numbers.*
<a name="markdown"></a>
### Send a Markdown message to ourself (Saved Messages)
<a name="html"></a>
### Send a Markdown or HTML-formatted message to ourself (Saved Messages)
```csharp
using var client = new WTelegram.Client(Environment.GetEnvironmentVariable);
var user = await client.LoginUserIfNeeded();
// Markdown-style text:
var text = $"Hello __dear *{Markdown.Escape(user.first_name)}*__\n" +
"Enjoy this `userbot` written with [WTelegramClient](https://github.com/wiz0u/WTelegramClient)";
var entities = client.MarkdownToEntities(ref text);
await client.SendMessageAsync(InputPeer.Self, text, entities: entities);
// HTML-formatted text:
var text2 = $"Hello <u>dear <b>{HtmlText.Escape(user.first_name)}</b></u>\n" +
"Enjoy this <code>userbot</code> written with <a href=\"https://github.com/wiz0u/WTelegramClient\">WTelegramClient</a>";
var entities2 = client.HtmlToEntities(ref text2);
await client.SendMessageAsync(InputPeer.Self, text2, entities: entities2);
```
See [MarkdownV2 formatting style](https://core.telegram.org/bots/api/#markdownv2-style) for details.
See [MarkdownV2 formatting style](https://core.telegram.org/bots/api/#markdownv2-style) and [HTML formatting style](https://core.telegram.org/bots/api/#html-style) for details.
*Note: For the `tg://user?id=` notation to work, that user's access hash must have been collected first ([see below](#collect-access-hash))*
<a name="fun"></a>

97
src/TL.Helpers.cs
View file

@ -488,7 +488,7 @@ namespace TL
public static class Markdown
{
/// <summary>Converts a Markdown text into the (Entities + plain text) format used by Telegram messages</summary>
/// <summary>Converts a <a href="https://core.telegram.org/bots/api/#markdownv2-style">Markdown text</a> into the (Entities + plain text) format used by Telegram messages</summary>
/// <param name="client">Client, used for getting access_hash for <c>tg://user?id=</c> URLs</param>
/// <param name="text">[in] The Markdown text<br/>[out] The same (plain) text, stripped of all Markdown notation</param>
/// <returns>The array of formatting entities that you can pass (along with the plain text) to <see cref="WTelegram.Client.SendMessageAsync">SendMessageAsync</see> or <see cref="WTelegram.Client.SendMediaAsync">SendMediaAsync</see></returns>
@ -601,4 +601,99 @@ namespace TL
return sb?.ToString() ?? text;
}
}
public static class HtmlText
{
/// <summary>Converts an <a href="https://core.telegram.org/bots/api/#html-style">HTML-formatted text</a> into the (Entities + plain text) format used by Telegram messages</summary>
/// <param name="client">Client, used for getting access_hash for <c>tg://user?id=</c> URLs</param>
/// <param name="text">[in] The HTML-formatted text<br/>[out] The same (plain) text, stripped of all HTML tags</param>
/// <returns>The array of formatting entities that you can pass (along with the plain text) to <see cref="WTelegram.Client.SendMessageAsync">SendMessageAsync</see> or <see cref="WTelegram.Client.SendMediaAsync">SendMediaAsync</see></returns>
public static MessageEntity[] HtmlToEntities(this WTelegram.Client client, ref string text)
{
var entities = new List<MessageEntity>();
var sb = new StringBuilder(text);
int end;
for (int offset = 0; offset < sb.Length;)
{
char c = sb[offset];
if (c == '&')
{
for (end = offset + 1; end < sb.Length; end++)
if (sb[end] == ';') break;
if (end >= sb.Length) break;
var html = HttpUtility.HtmlDecode(sb.ToString(offset, end - offset + 1));
if (html.Length == 1)
{
sb[offset] = html[0];
sb.Remove(++offset, end - offset + 1);
}
else
offset = end + 1;
}
else if (c == '<')
{
for (end = ++offset; end < sb.Length; end++)
if (sb[end] == '>') break;
if (end >= sb.Length) break;
bool closing = sb[offset] == '/';
var tag = closing ? sb.ToString(offset + 1, end - offset - 1) : sb.ToString(offset, end - offset);
sb.Remove(--offset, end + 1 - offset);
switch (tag)
{
case "b": case "strong": ProcessEntity<MessageEntityBold>(); break;
case "i": case "em": ProcessEntity<MessageEntityItalic>(); break;
case "u": case "ins": ProcessEntity<MessageEntityUnderline>(); break;
case "s": case "strike": case "del": ProcessEntity<MessageEntityStrike>(); break;
case "span class=\"tg-spoiler\"":
case "span" when closing:
case "tg-spoiler": ProcessEntity<MessageEntitySpoiler>(); break;
case "code": ProcessEntity<MessageEntityCode>(); break;
case "pre": ProcessEntity<MessageEntityPre>(); break;
default:
if (closing)
{
if (tag == "a")
{
var prevEntity = entities.LastOrDefault(e => e.length == -1);
if (prevEntity is InputMessageEntityMentionName or MessageEntityTextUrl)
prevEntity.length = offset - prevEntity.offset;
}
}
else if (tag.StartsWith("a href=\"") && tag.EndsWith("\""))
{
tag = tag[8..^1];
if (tag.StartsWith("tg://user?id=") && long.TryParse(tag[13..], out var user_id) && client.GetAccessHashFor<User>(user_id) is long hash)
entities.Add(new InputMessageEntityMentionName { offset = offset, length = -1, user_id = new InputUser { user_id = user_id, access_hash = hash } });
else
entities.Add(new MessageEntityTextUrl { offset = offset, length = -1, url = tag });
}
else if (tag.StartsWith("code class=\"language-") && tag.EndsWith("\""))
{
if (entities.LastOrDefault(e => e.length == -1) is MessageEntityPre prevEntity)
prevEntity.language = tag[21..^1];
}
break;
}
void ProcessEntity<T>() where T : MessageEntity, new()
{
if (!closing)
entities.Add(new T { offset = offset, length = -1 });
else if (entities.LastOrDefault(e => e.length == -1) is T prevEntity)
prevEntity.length = offset - prevEntity.offset;
}
}
else
offset++;
}
text = sb.ToString();
return entities.Count == 0 ? null : entities.ToArray();
}
/// <summary>Replace special HTML characters with their &amp;xx; equivalent</summary>
/// <param name="text">The text to make HTML-safe</param>
/// <returns>The HTML-safe text, ready to be used in <see cref="HtmlToEntities">HtmlToEntities</see> without problems</returns>
public static string Escape(string text)
=> text.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;");
}
}