commit a8474aab1ed672798dbaa0a26a48c41674829c9c
Author: Daniel M <danielm-gitlab.dnml@dnml.de>
Date:   Wed Mar 24 18:46:24 2021 +0100

    Initial version

diff --git a/.gitignore b/.gitignore
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec600b26223b2948cedfde2a0aa6756dcf1fef616f43d7b3097aaf53a6c4d92b"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winreg"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
+dependencies = [
+ "winapi",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..43c9922
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "fdl"
+version = "0.1.0"
+authors = ["daniel m <danielm@dnml.de>"]
+edition = "2018"
+
+[dependencies]
+tokio = { version = "1.2.0", features = [ "full" ] }
+reqwest = { version = "0.11.2", features = [ "stream" ] }
+futures = "0.3.12"
+percent-encoding = "2.1.0"
+regex = "1.4.3"
+bytes = "1.0.1"
+crossterm = "0.19.0"
+clap = "2.33.3"
+#futures-util = "0.3.13"
diff --git a/src/dlreport.rs b/src/dlreport.rs
new file mode 100644
index 0000000..fe2ba56
--- /dev/null
+++ b/src/dlreport.rs
@@ -0,0 +1,48 @@
+use tokio::sync::mpsc;
+
+use crate::errors::*;
+
+
+#[derive(Clone, Debug)]
+pub enum DlStatus {
+    Init {
+        bytes_total: u64,
+        filename: String
+    },
+    Update {
+        speed_mbps: f64,
+        bytes_curr: u64
+    },
+    Done {
+        duration_ms: u64
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct DlReport {
+    pub id: i32,
+    pub status: DlStatus
+}
+
+pub struct DlReporter {
+    id: i32,
+    transmitter: mpsc::UnboundedSender<DlReport>
+}
+
+impl DlReporter {
+    pub fn new(id: i32, transmitter: mpsc::UnboundedSender<DlReport>) -> DlReporter {
+        DlReporter {
+            id: id,
+            transmitter: transmitter
+        }
+    }
+
+    pub fn send(& self, status: DlStatus) -> ResBE<()> {
+        self.transmitter.send(
+            DlReport {
+                id: self.id,
+                status: status
+            }
+        ).map_err(|e| e.into())
+    }
+}
diff --git a/src/download.rs b/src/download.rs
new file mode 100644
index 0000000..d9766e9
--- /dev/null
+++ b/src/download.rs
@@ -0,0 +1,277 @@
+use std::path::Path;
+use tokio::io::AsyncWriteExt;
+use std::time::SystemTime;
+use percent_encoding::percent_decode_str;
+
+use crate::errors::*;
+use crate::dlreport::*;
+
+
+struct RollingAverage {
+    index: usize,
+    data: Vec<f64>
+}
+
+impl RollingAverage {
+
+    fn new(size: usize) -> Self {
+        RollingAverage {
+            index: 0,
+            data: Vec::with_capacity(size)
+        }
+    }
+
+    fn value(&self) -> f64 {
+        if self.data.len() == 0 {
+            0.0
+        } else {
+            let sum: f64 = self.data.iter().sum();
+            sum / self.data.len() as f64
+        }
+    }
+
+    fn add(&mut self, val: f64) {
+        if self.data.capacity() == self.data.len() {
+
+            self.data[self.index] = val;
+
+            self.index += 1;
+            if self.index >= self.data.capacity() {
+                self.index = 0;
+            }
+
+        } else {
+            self.data.push(val);
+        }
+    }
+
+}
+
+/// Get the filename at the end of the given URL. This will decode the URL Encoding.
+pub fn url_to_filename(url: &str) -> String {
+    let url_dec = percent_decode_str(&url).decode_utf8_lossy().to_owned().to_string();
+    let file_name = std::path::Path::new(&url_dec).file_name().unwrap().to_str().unwrap();
+    file_name.to_string()
+}
+
+#[allow(unused)]
+pub async fn download(url: &str, into_file: &str) -> ResBE<()> {
+    let into_file = Path::new(into_file);
+
+    let mut resp = reqwest::Client::new()
+        .get(url)
+        .send().await?;
+    
+    let mut ofile = tokio::fs::OpenOptions::new()
+        // Open in write mode
+        .write(true)
+        // Delete and overwrite the file
+        .truncate(true)
+        // Create the file if not existant
+        .create(true)
+        .open(into_file).await?;
+
+    // Read data from server as long as new data is available
+    while let Some(chunk) = resp.chunk().await? {
+        // Write the received data into the file
+        ofile.write_all(&chunk).await?;
+    }
+    
+    // Ensure that IO is completed
+    ofile.flush().await?;
+
+    Ok(())
+}
+
+pub async fn download_feedback(url: &str, into_file: &str, rep: DlReporter) -> ResBE<()> {
+    let into_file = Path::new(into_file);
+
+    // Send the HTTP request to download the given link
+    let mut resp = reqwest::Client::new()
+        .get(url)
+        .send().await?;
+
+    // Error out if the server response is not success (something went wrong)
+    if !resp.status().is_success() {
+        return Err(DlError::BadHttpStatus.into());
+    }
+
+    // Get the content length for status update. If not present, error out cause 
+    // without progress everything sucks anyways
+    let content_length = match resp.headers().get(reqwest::header::CONTENT_LENGTH) {
+        Some(cl) => cl.to_str()?.parse::<u64>()?,
+        None => return Err(DlError::ContentLengthUnknown.into())
+    };
+    
+    // Open the local output file
+    let mut ofile = tokio::fs::OpenOptions::new()
+        // Open in write mode
+        .write(true)
+        // Delete and overwrite the file
+        .truncate(true)
+        // Create the file if not existant
+        .create(true)
+        .open(into_file).await?;
+
+    let filename = into_file.file_name().unwrap().to_str().unwrap();
+
+    // Report the download start
+    rep.send(
+        DlStatus::Init {
+            bytes_total: content_length,
+            filename: filename.to_string()
+        }
+    )?;
+
+
+    let mut curr_progress = 0;
+    let mut speed_mbps = 0.0;
+
+    let t_start = SystemTime::now();
+
+    let mut t_last_speed = SystemTime::now();
+    let mut last_bytecount = 0;
+
+    let mut average_speed = RollingAverage::new(5);
+
+    // Read data from server as long as new data is available
+    while let Some(chunk) = resp.chunk().await? {
+
+        // Write the received data into the file
+        ofile.write_all(&chunk).await?;
+
+        let datalen = chunk.len() as u64;
+
+        // Update progress
+        curr_progress += datalen;
+
+        // Update the number of bytes downloaded since the last report
+        last_bytecount += datalen;
+
+        // Update the reported download speed after every 10MB  
+        if last_bytecount > 10_000_000 {
+            let t_elapsed = t_last_speed.elapsed()?.as_millis();
+
+            // Update rolling average
+            average_speed.add(
+                (last_bytecount as f64) / (1000.0 * t_elapsed as f64)
+            );
+
+            speed_mbps = average_speed.value();
+
+            // Reset the time and bytecount
+            last_bytecount = 0;
+            t_last_speed = SystemTime::now();
+        }
+
+        // Send status update report
+        rep.send(
+            DlStatus::Update {
+                speed_mbps: speed_mbps,
+                bytes_curr: curr_progress
+            }
+        )?;
+    }
+    
+    // Ensure that IO is completed
+    ofile.flush().await?;
+
+    let duration_ms = t_start.elapsed()?.as_millis() as u64;
+
+    // Send report that the download is finished
+    rep.send(
+        DlStatus::Done {
+            duration_ms: duration_ms
+        }
+    )?;
+
+    Ok(())
+}
+
+pub async fn http_get_filesize_and_range_support(url: &str) -> ResBE<(u64, bool)> {
+    let resp = reqwest::Client::new()
+        .head(url)
+        .send().await?;
+
+    if let Some(filesize) = resp.headers().get(reqwest::header::CONTENT_LENGTH) {
+        if let Ok(val_str) = filesize.to_str() {
+            if let Ok(val) = val_str.parse::<u64>() {
+
+                let mut range_supported = false;
+
+                if let Some(range) = resp.headers().get(reqwest::header::ACCEPT_RANGES) {
+                    if let Ok(range) = range.to_str() {
+                        if range == "bytes" {
+                            range_supported = true;
+                        }
+                    }
+                }
+
+                return Ok((val, range_supported));
+            }
+        }
+    }
+
+    Err(DlError::ContentLengthUnknown.into())
+}
+
+
+
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn rolling_average() {
+        let mut ra = RollingAverage::new(3);
+
+        assert_eq!(0, ra.data.len());
+        assert_eq!(3, ra.data.capacity());
+
+        assert_eq!(0.0, ra.value());
+
+        // 10 / 1 = 10
+        ra.add(10.0);
+        assert_eq!(1, ra.data.len());
+        assert_eq!(10.0, ra.value());
+
+        // (10 + 20) / 2 = 15
+        ra.add(20.0);
+        assert_eq!(2, ra.data.len());
+        assert_eq!(15.0, ra.value());
+
+        // (10 + 20 + 30) / 3 = 20
+        ra.add(30.0);
+        assert_eq!(3, ra.data.len());
+        assert_eq!(20.0, ra.value());
+
+        assert_eq!(10.0, ra.data[0]);
+        assert_eq!(20.0, ra.data[1]);
+        assert_eq!(30.0, ra.data[2]);
+
+        // This should replace the oldest value (index 1)
+        ra.add(40.0);
+        
+        assert_eq!(3, ra.data.len());
+        assert_eq!(3, ra.data.capacity());
+
+        // (40 + 20 + 30) / 3 = 30
+        assert_eq!(30.0, ra.value());
+
+        assert_eq!(40.0, ra.data[0]);
+        assert_eq!(20.0, ra.data[1]);
+        assert_eq!(30.0, ra.data[2]);
+
+        
+        ra.add(50.0);
+        ra.add(60.0);
+        ra.add(70.0);
+
+        assert_eq!(70.0, ra.data[0]);
+        assert_eq!(50.0, ra.data[1]);
+        assert_eq!(60.0, ra.data[2]);
+
+    }
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..ae06f1b
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,26 @@
+use std::error::Error;
+use std::fmt::{ self, Display, Formatter };
+
+/// Result Boxed Error
+pub type ResBE<T> = Result<T, Box<dyn Error>>;
+
+#[derive(Clone, Debug)]
+pub enum DlError {
+    BadHttpStatus,
+    ContentLengthUnknown,
+    Other
+}
+
+impl Error for DlError {}
+
+impl Display for DlError {
+
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            DlError::BadHttpStatus => write!(f, "Bad http response status"),
+            DlError::ContentLengthUnknown => write!(f, "Content-Length is unknown"),
+            DlError::Other => write!(f, "Unknown download error")
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..33c2567
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,404 @@
+use std::path::Path;
+use std::process::exit;
+use clap::{ App, Arg, ArgGroup, crate_version };
+use tokio::sync::mpsc;
+use futures::future::join_all;
+use std::time::SystemTime;
+use std::io::BufRead;
+use std::collections::HashMap;
+
+use dlreport::{ DlReport, DlStatus, DlReporter };
+use errors::ResBE;
+
+mod zippy;
+mod download;
+mod errors;
+mod dlreport;
+
+
+#[tokio::main]
+async fn main() -> ResBE<()> {
+
+    let arguments = App::new("FDL - Fast/File Downloader")
+        .version(crate_version!())
+        .about("Download files fast")
+        .arg(
+            Arg::with_name("outdir")
+                .short("o")
+                .long("outdir")
+                .value_name("OUTPUT DIR")
+                .takes_value(true)
+                .help("Set the output directory")
+        )
+        .arg(
+            Arg::with_name("numdl")
+                .short("n")
+                .long("numdl")
+                .value_name("NUMBER OF CONCURRENT DOWNLOADS")
+                .takes_value(true)
+                .help("Specify the number concurrent downloads")
+        )
+        .arg(
+            Arg::with_name("zippyshare")
+                .short("z")
+                .long("zippy")
+                .takes_value(false)
+                .help("The provided URLs are zippyshare URLs and need to be resolved")
+        )
+        .group(
+            ArgGroup::with_name("action")
+                .required(true)
+        )
+        .arg(
+            Arg::with_name("listfile")
+                .short("l")
+                .long("listfile")
+                .value_name("URL LIST")
+                .takes_value(true)
+                .group("action")
+                .help("Download all files form the specified url list")
+        )
+        .arg(
+            Arg::with_name("download")
+                .short("d")
+                .long("download")
+                .value_name("URL")
+                .takes_value(true)
+                .group("action")
+                .help("Download only the specified URL")
+        )
+        .arg(
+            Arg::with_name("resolve")
+                .short("r")
+                .long("resolve")
+                .value_name("URL")
+                .takes_value(true)
+                .group("action")
+                .help("Resolve the zippyshare url to real download url")
+        )
+        .get_matches();
+    
+
+    
+
+    let outdir = match arguments.value_of("outdir") {
+        Some(it) => it,
+        None => "./"
+    };
+
+    let numparal = match arguments.value_of("numdl") {
+        Some(it) => it,
+        None => "1"
+    };
+
+    let numparal: i32 = match numparal.parse() {
+        Ok(it) => it,
+        Err(_) => {
+            eprintln!("Invalid value for numdl: {}", numparal);
+            exit(1);
+        }
+    };
+
+    let is_zippy = arguments.is_present("zippyshare");
+
+    if arguments.is_present("listfile") {
+
+        let listfile = arguments.value_of("listfile").unwrap();
+
+        let ifile = std::fs::File::open(listfile)?;
+
+        let mut urls: Vec<String> = std::io::BufReader::new(ifile)
+            .lines()
+            .map(|l| l.unwrap())
+            .filter(|url| url.len() > 0 && !url.starts_with("#"))
+            .collect();
+
+        if is_zippy {
+            let mut zippy_urls = Vec::new();
+            for url in urls {
+                zippy_urls.push(
+                    match zippy::resolve_link(&url).await {
+                        Ok(url) => url,
+                        Err(e) => {
+                            println!("Zippyshare link could not be resolved");
+                            eprintln!("{}", e);
+                            exit(1);
+                        }
+                    }
+                )
+            }
+
+            urls = zippy_urls;
+        }
+
+        download_multiple(urls, outdir, numparal).await?;
+        
+    } else if arguments.is_present("download") {
+
+        let url = arguments.value_of("download").unwrap();
+        let url = if is_zippy {
+            match zippy::resolve_link(&url).await {
+                Ok(url) => url,
+                Err(e) => {
+                    println!("Zippyshare link could not be resolved");
+                    eprintln!("{}", e);
+                    exit(1);
+                }
+            }
+        } else {
+            url.to_string()
+        };
+
+        download_one(&url, outdir).await?;
+
+    } else if arguments.is_present("resolve") {
+
+        let url = arguments.value_of("resolve").unwrap();
+
+        match zippy::resolve_link(&url).await {
+            Ok(resolved_url) => {
+                println!("{}", resolved_url);
+            },
+            Err(e) => {
+                println!("Zippyshare link could not be resolved");
+                eprintln!("{}", e);
+                exit(1);
+            }
+
+        }
+
+    } else {
+        println!("Something went very wrong...");
+    }
+
+    Ok(())
+}
+
+
+async fn download_one(url: &str, outdir: &str) -> ResBE<()> {
+    let outdir = Path::new(outdir);
+
+    if !outdir.exists() {
+        std::fs::create_dir_all(outdir)?;
+    }
+
+    
+    let file_name = download::url_to_filename(url);
+    let into_file = outdir.join(Path::new(&file_name));
+    let into_file = into_file.to_str().unwrap().to_string();
+    let path_into_file = Path::new(&into_file);
+
+    // If file with same name is present locally, check filesize
+    if path_into_file.exists() {
+        let (filesize, _) = download::http_get_filesize_and_range_support(&url).await?;
+        let local_filesize = std::fs::metadata(path_into_file)?.len();
+
+        if filesize == local_filesize {
+            println!("Skipping file '{}': already present", &file_name);
+            return Ok(());
+        } else {
+            println!("Replacing file '{}': present but not completed", &file_name);
+        }
+    }
+
+    // Create com channel to get feedback on download progress
+    let (tx, mut rx) = mpsc::unbounded_channel::<DlReport>();
+
+    // Start download nonblocking
+    let url = url.to_string();
+    let jh_download = tokio::spawn(async move {
+        // Create reporter with id 0 since there is only one anyways
+        let rep = DlReporter::new(0, tx);
+
+        if let Err(e) = download::download_feedback(&url, &into_file, rep).await {
+            eprintln!("Error while downloading");
+            eprintln!("{}", e);
+        }
+    });
+
+
+    let mut t_last = SystemTime::UNIX_EPOCH;
+
+    let mut filesize = 0;
+
+    // Handle download status updates until all transmitters are closed 
+    // this happens when the download is completed
+    while let Some(update) = rx.recv().await {
+        match update.status {
+
+            DlStatus::Init {
+                bytes_total,
+                filename
+            } => {
+
+                println!("Starting download for file '{}'", &filename);
+                filesize = bytes_total;
+
+            },
+            DlStatus::Update {
+                speed_mbps,
+                bytes_curr
+            } => {
+
+                // Print update every second, otherwise ignore the updates
+                if t_last.elapsed()?.as_millis() > 1000 {
+                    let percent_complete = bytes_curr as f64 / filesize as f64 * 100.0;
+                    println!("Status: {:6.2} mb/s {:5.2}% completed", speed_mbps, percent_complete);
+
+                    t_last = SystemTime::now();
+                }
+
+            },
+            DlStatus::Done {
+                duration_ms
+            } => {
+
+                println!("Status: 100% completed");
+                println!("Download took {} seconds", (duration_ms / 1000));
+                
+            }
+
+        }
+    }
+
+    // Await the download just to make sure
+    jh_download.await?;
+
+    Ok(())
+}
+
+async fn download_multiple(urls: Vec<String>, outdir: &str, numparal: i32) -> ResBE<()> {
+    let outdir = Path::new(outdir);
+
+    if !outdir.exists() {
+        std::fs::create_dir_all(outdir)?;
+    }
+
+    let mut joiners = Vec::new();
+
+    let (tx, mut rx) = mpsc::unbounded_channel::<DlReport>();
+
+    for offset in 0..numparal {
+
+        let urls: Vec<String> = urls
+            .iter()
+            .enumerate()
+            .filter(|(index, _)| (index) % numparal as usize == offset as usize)
+            .map(|(_, v)| v.to_owned())
+            .collect();
+        
+        let tx = tx.clone();
+        let outdir = outdir.to_owned();
+        let offset = offset;
+        joiners.push(tokio::task::spawn(async move {
+
+            for (i, url) in urls.iter().enumerate() {
+
+                // Recalculated index in the main url vector, used as id
+                let global_url_index = i as i32 * numparal + offset;
+
+                let file_name = download::url_to_filename(&url);
+                let into_file = outdir.join(Path::new(&file_name));
+                let into_file = into_file.to_str().unwrap().to_string();
+                let path_into_file = Path::new(&into_file);
+            
+                // If file with same name is present locally, check filesize
+                if path_into_file.exists() {
+                    let (filesize, _) = download::http_get_filesize_and_range_support(&url).await.unwrap();
+                    let local_filesize = std::fs::metadata(path_into_file).unwrap().len();
+            
+                    if filesize == local_filesize {
+                        println!("Skipping file '{}': already present", &file_name);
+                        continue;
+                    } else {
+                        println!("Replacing file '{}': present but not completed", &file_name);
+                    }
+                }
+
+                let rep = DlReporter::new(global_url_index, tx.clone());
+
+                if let Err(e) = download::download_feedback(&url, &into_file, rep).await {
+                    eprintln!("Error while downloading '{}'", file_name);
+                    eprintln!("{}", e);
+                }
+
+            }
+        }))
+
+    }
+    
+    drop(tx);
+
+    // filename, total size bytes, current size bytes, download speed mbps
+    let mut statuses: HashMap<i32, (String, u64, u64, f64)> = HashMap::new();
+    let mut t_last = SystemTime::now();
+
+    while let Some(update) = rx.recv().await {
+        match update.status {
+
+            DlStatus::Init {
+                bytes_total,
+                filename
+            } => {
+
+                println!("Starting download for file '{}'", &filename);
+                statuses.insert(update.id, (filename, bytes_total, 0, 0.0));
+
+            },
+            DlStatus::Update {
+                speed_mbps,
+                bytes_curr
+            } => {
+
+                // Scope the reference to prevent borrowing conflict later
+                {
+                    let s = &mut statuses.get_mut(&update.id).unwrap();
+                    s.2 = bytes_curr;
+                    s.3 = speed_mbps;
+                }
+
+                if t_last.elapsed().unwrap().as_millis() > 2000 {
+
+                    let mut dl_speed_sum = 0.0;
+
+                    for (_k, v) in &statuses {
+                        let filename = &v.0;
+                        let filesize = v.1;
+                        let bytes_curr = v.2;
+                        let speed_mbps = v.3;
+
+                        let percent_complete = bytes_curr as f64 / filesize as f64 * 100.0;
+                        println!("Status: {:6.2} mb/s {:5.2}% completed  '{}'", speed_mbps, percent_complete, filename);
+
+                        dl_speed_sum += speed_mbps;
+                    }
+
+                    println!("Accumulated download speed: {:6.2} mb/s\n", dl_speed_sum);
+
+                    t_last = SystemTime::now();
+
+                }
+
+            },
+            DlStatus::Done {
+                duration_ms
+            } => {
+
+                println!(
+                    "Status: 100% completed '{}'\nDownload took {} seconds", 
+                    &statuses.get(&update.id).unwrap().0,
+                    (duration_ms / 1000)
+                );
+
+                statuses.remove(&update.id);
+                
+            }
+
+        }
+    }
+
+    join_all(joiners).await;
+
+
+    Ok(())
+}
\ No newline at end of file
diff --git a/src/zippy.rs b/src/zippy.rs
new file mode 100644
index 0000000..2af40d7
--- /dev/null
+++ b/src/zippy.rs
@@ -0,0 +1,91 @@
+use regex::Regex;
+use std::io::{ Error, ErrorKind };
+
+use crate::errors::ResBE;
+
+#[allow(dead_code)]
+pub async fn resolve_link_old(url: &str) -> ResBE<String> {
+
+    // Regex to check if the provided url is a zippyshare download url
+    let re = Regex::new(r"(https://www\d*\.zippyshare\.com)")?;
+    if !re.is_match(&url) {
+        return Err(Error::new(ErrorKind::Other, "URL is not a zippyshare url").into());
+    }
+
+    // Extract the hostname (with https:// prefix) for later
+    let base_host = &re.captures(&url).unwrap()[0];
+
+    // Download the html body for the download page
+    let body = reqwest::get(url).await?
+        .text().await?;
+
+    // Regex to match the javascript part of the html that generates the real download link
+    let re = Regex::new(r#""(/d/\w+/)" \+ \((\d+) % (\d+) \+ (\d+) % (\d+)\) \+ "(/.+\.rar)";"#)?;
+
+    if let Some(cap) = re.captures(&body) {
+
+        // Extract the magic numbers used to generate the download link
+        let n1: i32 = i32::from_str_radix(&cap[2], 10)?;
+        let n2: i32 = i32::from_str_radix(&cap[3], 10)?;
+        let n3: i32 = i32::from_str_radix(&cap[4], 10)?;
+        let n4: i32 = i32::from_str_radix(&cap[5], 10)?;
+
+        // Mix the numbers together
+        let mixed = n1 % n2 + n3 % n4;
+
+        // Assemble the download link
+        let dl_url = format!("{}{}{}{}", base_host, &cap[1], mixed, &cap[6]);
+
+        Ok(dl_url)
+
+    } else {
+        Err(Error::new(ErrorKind::Other, "Link not found").into())
+    } 
+}
+
+pub async fn resolve_link(url: &str) -> ResBE<String> {
+
+    // Regex to check if the provided url is a zippyshare download url
+    let re = Regex::new(r"(https://www\d*\.zippyshare\.com)")?;
+    if !re.is_match(&url) {
+        return Err(Error::new(ErrorKind::Other, "URL is not a zippyshare url").into());
+    }
+
+    // Extract the hostname (with https:// prefix) for later
+    let base_host = &re.captures(&url).unwrap()[0];
+
+    // Download the html body for the download page
+    let body = reqwest::get(url).await?
+        .text().await?;
+
+    // Regex to match the javascript part of the html that generates the real download link
+    let re_a = Regex::new(r#"var a = (\d+);"#)?;
+    let re_b = Regex::new(r#"var b = (\d+);"#)?;
+    let re_concat = Regex::new(r#"document\.getElementById\('dlbutton'\)\.href = "(/d/.+/)"\+\(a \+ (\d+)%b\)\+"(/.+\.rar)";"#)?;
+
+    let cap_a = match re_a.captures(&body) {
+        Some(cap) => cap,
+        None => return Err(Error::new(ErrorKind::Other, "Link not found").into())
+    };
+
+    let cap_b = match re_b.captures(&body) {
+        Some(cap) => cap,
+        None => return Err(Error::new(ErrorKind::Other, "Link not found").into())
+    };
+
+    let cap_concat = match re_concat.captures(&body) {
+        Some(cap) => cap,
+        None => return Err(Error::new(ErrorKind::Other, "Link not found").into())
+    };
+
+    let a: i32 = i32::from_str_radix(&cap_a[1], 10)?;
+    let b: i32 = i32::from_str_radix(&cap_b[1], 10)?;
+
+    let c: i32 = i32::from_str_radix(&cap_concat[2], 10)?;
+
+    let mixed = (a/3) + (c%b);
+
+    let dl_url = format!("{}{}{}{}", &base_host, &cap_concat[1], mixed, &cap_concat[3]);
+
+    Ok(dl_url)
+}