downloading from Maven central

Cargo.toml

@@ -9,3 +9,4 @@ env_logger = "0.11"
 regex="1.11"
 maud = "*"
 zip = "4.3"
+reqwest = { version = "0.12", features = ["json", "blocking", "native-tls"] }

src/main.rs

@@ -1,12 +1,9 @@
-use std::hash::Hash;
 use std::path::PathBuf;
-use std::{env, fs};
+use std::env;
 use undeepend::maven::project::parse_project;
 use undeepend::maven::reporter::report;
 
 fn main() {
-    let home_dir = env::var("HOME").unwrap();
-
     let args = std::env::args().collect::<Vec<String>>();
     let dir = if args.len() == 1 {
         env::current_dir().expect("Could not access current directory")

src/maven/pom.rs

@@ -1,5 +1,6 @@
 use std::collections::HashMap;
 use std::env;
+use std::fmt::Display;
 use std::path::PathBuf;
 use std::sync::LazyLock;
 
@@ -56,7 +57,7 @@ pub struct Dependency {
 
 impl Dependency {
     /// returns a relative path to the dependency location
-    pub fn to_path(&self) -> PathBuf {
+    pub fn to_jar_path(&self) -> PathBuf {
         let mut path = PathBuf::new();
         path.push(self.group_id.replace(".", "/"));
         path.push(&self.artifact_id);
@@ -69,10 +70,23 @@ impl Dependency {
 
     /// returns an absolute path based on the default maven localRepository location
     // useful?
-    pub fn to_absolute_path(&self) -> PathBuf {
+    pub fn to_absolute_jar_path(&self) -> PathBuf {
         let mut absolute_path = PathBuf::from(HOME.as_str());
         absolute_path.push(".m2/repository");
-        absolute_path.push(self.to_path());
+        absolute_path.push(self.to_jar_path());
         absolute_path
     }
 }
+
+use std::fmt;
+
+impl Display for Dependency {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let version = self.version.clone().unwrap_or_else(|| "latest".to_string());
+        write!(
+            f,
+            "{}/{}/{}/{}-{}",
+            self.group_id.replace(".","/"), self.artifact_id, version, self.artifact_id, version
+        )
+    }
+}

src/maven/project.rs

@@ -196,3 +196,31 @@ impl Project {
         get_project_pom(&self.root, group_id, artifact_id)
     }
 }
+
+pub struct PomIterator<'a> {
+    project: &'a Project,
+    idx: usize,
+}
+
+impl<'a> PomIterator<'a> {
+    pub fn new(project: &'a Project) -> Self {
+        PomIterator {
+            project,
+            idx: 0,
+        }
+    }
+}
+
+impl<'a> Iterator for PomIterator<'a> {
+    type Item = &'a Pom;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.idx < self.project.root.modules.len() {
+            let module = &self.project.root.modules[self.idx];
+            self.idx += 1;
+            Some(module)
+        } else {
+            None
+        }
+    }
+}

src/maven/reporter.rs

@@ -1,19 +1,24 @@
+use crate::maven::pom::Dependency;
 use crate::maven::project::Project;
 use regex::Regex;
 use std::collections::HashSet;
 use std::fs::File;
-use std::path::Path;
+use std::io::{BufWriter, Read, Write};
+use std::path::{Path, PathBuf};
 use std::sync::LazyLock;
 use zip::ZipArchive;
 
 static CLASS_EXPR: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"(.+)/.+\.class").unwrap());
+const MAVEN_CENTRAL: &str = "https://repo1.maven.org/maven2/";
 
 pub fn report(project: &Project) {
     let pom = &project.root;
     for dep in &project.get_dependencies(pom) {
-        println!("{:?}", dep);
-        //TODO all modules
-        let jar_file = File::open(dep.to_absolute_path()).expect("Can't open jar file");
+        let path = PathBuf::from(dep.to_absolute_jar_path());
+        if !path.exists() {
+            download(dep).expect(&format!("Can't download jar file {}", dep));
+        }
+        let jar_file = File::open(dep.to_absolute_jar_path()).expect("Can't open jar file");
         let mut archive = ZipArchive::new(jar_file).expect("Can't read jar file");
 
         let mut packages = HashSet::new();
@@ -39,6 +44,36 @@ pub fn report(project: &Project) {
     }
 }
 
+use reqwest::blocking::Client;
+
+fn download(dep: &Dependency) -> Result<(), String> {
+    //TODO inspect settings.xml
+
+    let url = format!("{}{}.jar", MAVEN_CENTRAL, dep);
+
+    let client = Client::builder()
+        .timeout(std::time::Duration::from_secs(30)) // Ruime timeout instellen
+        .build()
+        .map_err(|e| e.to_string())?;
+
+    println!("Downloading {}", &url);
+    let response = client
+        .get(&url)
+        .header("User-Agent", "Maven/1.0") // Goede practice om een User-Agent te sturen
+        .send()
+        .map_err(|e| e.to_string())?;
+    if response.status().is_success() {
+        let bytes = response.bytes().map_err(|e| e.to_string())?;
+        let mut buf_writer =
+            BufWriter::new(File::create(dep.to_absolute_jar_path()).map_err(|e| e.to_string())?);
+
+        buf_writer.write_all(&bytes).map_err(|e| e.to_string())?;
+        buf_writer.flush().map_err(|e| e.to_string())?;
+        println!("Downloaded {}", &url);
+    }
+    Ok(())
+}
+
 fn traverse(packages: &HashSet<String>, dir: &Path) {
     if dir.exists() {
         for entry in dir.read_dir().unwrap() {