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| 1 | +//! |
| 2 | +//! Copyright (C) 2023-2025 cyberknight777 |
| 3 | +//! |
| 4 | +//! SPDX-License-Identifier: MIT |
| 5 | +//! |
| 6 | +
|
| 7 | +use grammers_client::{ |
| 8 | + Client, |
| 9 | + media::Media, |
| 10 | + message::{InputMessage, Message}, |
| 11 | +}; |
| 12 | +use reqwest::Url; |
| 13 | +use std::path::{Path, PathBuf}; |
| 14 | +use tokio::fs; |
| 15 | + |
| 16 | +type Result = std::result::Result<(), Box<dyn std::error::Error>>; |
| 17 | + |
| 18 | +const DL_DIR: &str = "dl"; |
| 19 | +const DOWNLOAD_FAILED: &str = "<b>Download failed!</b>"; |
| 20 | +const DOWNLOAD_STARTED: &str = "<b>Downloading file...</b>"; |
| 21 | +const DOWNLOAD_USAGE: &str = "Reply to a <b>file</b> or give me a <b>proper download link</b>!"; |
| 22 | + |
| 23 | +fn filename_from_url(url: &Url) -> String { |
| 24 | + url.path_segments() |
| 25 | + .and_then(|segments| segments.filter(|segment| !segment.is_empty()).last()) |
| 26 | + .map(sanitize_filename) |
| 27 | + .filter(|name| !name.is_empty()) |
| 28 | + .unwrap_or_else(|| "download".to_string()) |
| 29 | +} |
| 30 | + |
| 31 | +fn sanitize_filename(name: &str) -> String { |
| 32 | + name.trim() |
| 33 | + .trim_matches('.') |
| 34 | + .chars() |
| 35 | + .map(|ch| match ch { |
| 36 | + '/' | '\\' | ':' | '*' | '?' | '"' | '<' | '>' | '|' | '\0' => '_', |
| 37 | + ch if ch.is_whitespace() => '_', |
| 38 | + _ => ch, |
| 39 | + }) |
| 40 | + .collect() |
| 41 | +} |
| 42 | + |
| 43 | +fn unique_path(dir: &Path, filename: &str) -> PathBuf { |
| 44 | + let mut path = dir.join(filename); |
| 45 | + if !path.exists() { |
| 46 | + return path; |
| 47 | + } |
| 48 | + |
| 49 | + let source = Path::new(filename); |
| 50 | + let stem = source |
| 51 | + .file_stem() |
| 52 | + .and_then(|value| value.to_str()) |
| 53 | + .filter(|value| !value.is_empty()) |
| 54 | + .unwrap_or("download"); |
| 55 | + let extension = source.extension().and_then(|value| value.to_str()); |
| 56 | + |
| 57 | + for index in 1.. { |
| 58 | + let candidate = match extension { |
| 59 | + Some(extension) => format!("{}-{}.{}", stem, index, extension), |
| 60 | + None => format!("{}-{}", stem, index), |
| 61 | + }; |
| 62 | + path = dir.join(candidate); |
| 63 | + if !path.exists() { |
| 64 | + return path; |
| 65 | + } |
| 66 | + } |
| 67 | + |
| 68 | + unreachable!() |
| 69 | +} |
| 70 | + |
| 71 | +async fn download_path(filename: &str) -> std::result::Result<PathBuf, Box<dyn std::error::Error>> { |
| 72 | + let dir = Path::new(DL_DIR); |
| 73 | + fs::create_dir_all(dir).await?; |
| 74 | + Ok(unique_path(dir, filename)) |
| 75 | +} |
| 76 | + |
| 77 | +fn filename_from_media(media: &Media) -> String { |
| 78 | + match media { |
| 79 | + Media::Photo(photo) => format!("photo_{}.jpg", photo.id()), |
| 80 | + Media::Document(document) => document |
| 81 | + .name() |
| 82 | + .map(sanitize_filename) |
| 83 | + .filter(|name| !name.is_empty()) |
| 84 | + .unwrap_or_else(|| format!("document_{}", document.id())), |
| 85 | + Media::Sticker(sticker) => sticker |
| 86 | + .document |
| 87 | + .name() |
| 88 | + .map(sanitize_filename) |
| 89 | + .filter(|name| !name.is_empty()) |
| 90 | + .unwrap_or_else(|| format!("sticker_{}.webp", sticker.document.id())), |
| 91 | + _ => "download".to_string(), |
| 92 | + } |
| 93 | +} |
| 94 | + |
| 95 | +async fn download_url(message: &Message, url: Url) -> Result { |
| 96 | + let status = message |
| 97 | + .reply(InputMessage::new().html(DOWNLOAD_STARTED)) |
| 98 | + .await?; |
| 99 | + |
| 100 | + let response = match reqwest::get(url.clone()).await { |
| 101 | + Ok(response) => response, |
| 102 | + Err(_) => { |
| 103 | + status |
| 104 | + .edit(InputMessage::new().html(DOWNLOAD_FAILED)) |
| 105 | + .await?; |
| 106 | + return Ok(()); |
| 107 | + } |
| 108 | + }; |
| 109 | + |
| 110 | + if !response.status().is_success() { |
| 111 | + status |
| 112 | + .edit( |
| 113 | + InputMessage::new().html(format!("{DOWNLOAD_FAILED}\nHTTP {}", response.status())), |
| 114 | + ) |
| 115 | + .await?; |
| 116 | + return Ok(()); |
| 117 | + } |
| 118 | + |
| 119 | + let bytes = match response.bytes().await { |
| 120 | + Ok(bytes) => bytes, |
| 121 | + Err(_) => { |
| 122 | + status |
| 123 | + .edit(InputMessage::new().html(DOWNLOAD_FAILED)) |
| 124 | + .await?; |
| 125 | + return Ok(()); |
| 126 | + } |
| 127 | + }; |
| 128 | + |
| 129 | + let path = download_path(&filename_from_url(&url)).await?; |
| 130 | + fs::write(&path, bytes).await?; |
| 131 | + status |
| 132 | + .edit(InputMessage::new().html(format!( |
| 133 | + "<b>Downloaded:</b> <code>{}</code>", |
| 134 | + path.display() |
| 135 | + ))) |
| 136 | + .await?; |
| 137 | + |
| 138 | + return Ok(()); |
| 139 | +} |
| 140 | + |
| 141 | +async fn download_reply_media(client: Client, message: &Message, media: Media) -> Result { |
| 142 | + let status = message |
| 143 | + .reply(InputMessage::new().html(DOWNLOAD_STARTED)) |
| 144 | + .await?; |
| 145 | + let path = download_path(&filename_from_media(&media)).await?; |
| 146 | + |
| 147 | + match client.download_media(&media, &path).await { |
| 148 | + Ok(_) => { |
| 149 | + status |
| 150 | + .edit(InputMessage::new().html(format!( |
| 151 | + "<b>Downloaded:</b> <code>{}</code>", |
| 152 | + path.display() |
| 153 | + ))) |
| 154 | + .await?; |
| 155 | + } |
| 156 | + Err(_) => { |
| 157 | + status |
| 158 | + .edit(InputMessage::new().html(DOWNLOAD_FAILED)) |
| 159 | + .await?; |
| 160 | + } |
| 161 | + } |
| 162 | + |
| 163 | + return Ok(()); |
| 164 | +} |
| 165 | + |
| 166 | +pub async fn knightcmd_dl(client: Client, message: &Message, link: String) -> Result { |
| 167 | + let link = link.trim(); |
| 168 | + |
| 169 | + if link.is_empty() { |
| 170 | + if let Some(reply) = client.get_reply_to_message(message).await? { |
| 171 | + if let Some(media) = reply.media() { |
| 172 | + download_reply_media(client, message, media).await?; |
| 173 | + } else { |
| 174 | + message |
| 175 | + .reply(InputMessage::new().html(DOWNLOAD_USAGE)) |
| 176 | + .await?; |
| 177 | + } |
| 178 | + } else { |
| 179 | + message |
| 180 | + .reply(InputMessage::new().html(DOWNLOAD_USAGE)) |
| 181 | + .await?; |
| 182 | + } |
| 183 | + return Ok(()); |
| 184 | + } |
| 185 | + |
| 186 | + let url = match Url::parse(link) { |
| 187 | + Ok(url) if matches!(url.scheme(), "http" | "https") => url, |
| 188 | + _ => { |
| 189 | + message |
| 190 | + .reply(InputMessage::new().html("<b>Invalid download link!</b>")) |
| 191 | + .await?; |
| 192 | + return Ok(()); |
| 193 | + } |
| 194 | + }; |
| 195 | + |
| 196 | + download_url(message, url).await?; |
| 197 | + |
| 198 | + return Ok(()); |
| 199 | +} |
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