Add support for sendcm

- Change the special url resolver code to better (still not optimally)
  support different services besides zippyshare
- Implement support for sendcm

Cargo.toml

@@ -2,7 +2,7 @@
 name = "ffdl"
 version = "0.1.2"
 authors = ["daniel m <danielm@dnml.de>"]
-edition = "2018"
+edition = "2021"
 description = "Download files fast"
 
 [dependencies]

src/integrations.rs

@@ -0,0 +1,26 @@
+mod zippy;
+mod sendcm;
+
+use anyhow::Result;
+
+pub enum IntegratedService {
+    ZippyShare,
+    SendCm,
+}
+
+pub fn is_integrated_url(url: &str) -> Option<IntegratedService> {
+    if zippy::is_zippyshare_url(url) {
+        Some(IntegratedService::ZippyShare)
+    } else if sendcm::is_sendcm_url(url) {
+        Some(IntegratedService::SendCm)
+    } else {
+        None
+    }
+}
+
+pub async fn resolve_integrated_url(url: &str, service: IntegratedService) -> Result<String> {
+    match service {
+        IntegratedService::ZippyShare => zippy::resolve_link(url).await,
+        IntegratedService::SendCm => sendcm::resolve_link(url).await,
+    }
+}

src/integrations/sendcm.rs

@@ -0,0 +1,84 @@
+use std::io::{Error, ErrorKind};
+
+use anyhow::Result;
+use regex::Regex;
+
+pub fn is_sendcm_url(url: &str) -> bool {
+    Regex::new(r"^https?://send\.cm/(?:d/)?[0-9a-zA-Z]+$")
+        .unwrap()
+        .is_match(url)
+}
+
+/*
+Updated: 01.04.2022
+Link generation code:
+- A post request is sent to the server using the form described below
+- The id field is the value which is used to generate the link
+- If the id is not found, the link is not generated
+- The id is the same as the url suffix when NOT using a /d/ prefix url
+- The reponse to the post request is a 302 redirect to the generated link
+
+```
+<form name="F1" method="POST" action="https://send.cm">
+<input type="hidden" name="op" value="download2">
+<input type="hidden" name="id" value="xxxxxxxxxx">
+<input type="hidden" name="rand" value="">
+<input type="hidden" name="referer" value="">
+<input type="hidden" name="method_free" value="">
+<input type="hidden" name="method_premium" value="">
+......
+```
+*/
+pub async fn resolve_link(url: &str) -> Result<String> {
+    let user_agent = "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:77.0) Gecko/20100101 Firefox/77.0";
+    let accept =
+        "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8";
+
+    // Add a few extra headers to the request in order to be less suspicious
+    let body = reqwest::Client::new()
+        .get(url)
+        .header("User-Agent", user_agent)
+        .header("Accept", accept)
+        .send()
+        .await?
+        .text()
+        .await?;
+
+    let re_link = Regex::new(r#"<input type="hidden" name="id" value="([0-9a-zA-Z]+)">"#)?;
+
+    let cap_link = match re_link.captures(&body) {
+        Some(cap) => cap,
+        None => return Err(Error::new(ErrorKind::Other, "Link not found").into()),
+    };
+
+    let id = &match cap_link.get(1) {
+        Some(id) => id.as_str(),
+        None => return Err(Error::new(ErrorKind::Other, "Link not found").into()),
+    };
+
+    let resp = reqwest::ClientBuilder::new()
+        .redirect(reqwest::redirect::Policy::none())
+        .build()?
+        .post("https://send.cm")
+        .header("User-Agent", user_agent)
+        .header("Accept", accept)
+        .form(&[
+            ("op", "download2"),
+            ("id", id),
+            ("rand", ""),
+            ("referer", ""),
+            ("method_free", ""),
+            ("method_premium", ""),
+        ])
+        .send()
+        .await?;
+
+    if resp.status().is_redirection() {
+        match resp.headers().get(reqwest::header::LOCATION) {
+            Some(location) => Ok(location.to_str()?.to_string()),
+            None => Err(Error::new(ErrorKind::Other, "Location header not found").into()),
+        }
+    } else {
+        Err(Error::new(ErrorKind::Other, "Link not found").into())
+    }
+}

src/main.rs

@@ -15,15 +15,15 @@ use crate::args::CLIArgs;
 use crate::clireporter::cli_print_reports;
 use crate::dlreport::{DlReport, DlReporter};
 use crate::download::{download_feedback, download_feedback_multi, http_file_info};
-use crate::zippy::is_zippyshare_url;
+use crate::integrations::{is_integrated_url, resolve_integrated_url};
 
 mod args;
 mod clireporter;
 mod dlreport;
 mod download;
 mod errors;
+mod integrations;
 mod misc;
-mod zippy;
 
 struct DlRequest {
     id: usize,
@@ -113,20 +113,21 @@ async fn download_job(urls: SyncQueue, reporter: UnboundedSender<DlReport>, cli_
         let reporter = DlReporter::new(dlreq.id as u32, reporter.clone());
 
         // Resolve the zippy url to the direct download url if necessary
-        let url = if is_zippyshare_url(&dlreq.url) {
-            match zippy::resolve_link(&dlreq.url).await {
-                Ok(url) => url,
-                Err(_e) => {
-                    report_msg!(
-                        reporter,
-                        "Zippyshare link could not be resolved, skipping: {}",
-                        dlreq.url
-                    );
-                    continue;
+        let url = match is_integrated_url(&dlreq.url) {
+            Some(service) => {
+                match resolve_integrated_url(&dlreq.url, service).await {
+                    Ok(url) => url,
+                    Err(_e) => {
+                        report_msg!(
+                            reporter,
+                            "Zippyshare link could not be resolved, skipping: {}",
+                            dlreq.url
+                        );
+                        continue;
+                    }
                 }
             }
-        } else {
-            dlreq.url.to_string()
+            None => dlreq.url,
         };
 
         let info = match http_file_info(&url).await {