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    use crate::compare::{assert_match_exact, find_json_mismatch};
    use crate::registry::{self, alt_api_path, FeatureMap};
    use flate2::read::GzDecoder;
    use std::collections::{HashMap, HashSet};
    use std::fs;
    use std::fs::File;
    use std::io::{self, prelude::*, SeekFrom};
    use std::path::{Path, PathBuf};
    use tar::Archive;

    fn read_le_u32<R>(mut reader: R) -> io::Result<u32>
    where
        R: Read,
    {
        let mut buf = [0; 4];
        reader.read_exact(&mut buf)?;
        Ok(u32::from_le_bytes(buf))
    }

    /// Checks the result of a crate publish.
    pub fn validate_upload(expected_json: &str, expected_crate_name: &str, expected_files: &[&str]) {
        let new_path = registry::api_path().join("api/v1/crates/new");
        _validate_upload(
            &new_path,
            expected_json,
            expected_crate_name,
            expected_files,
            &[],
        );
    }

    /// Checks the result of a crate publish, along with the contents of the files.
    pub fn validate_upload_with_contents(
        expected_json: &str,
        expected_crate_name: &str,
        expected_files: &[&str],
        expected_contents: &[(&str, &str)],
    ) {
        let new_path = registry::api_path().join("api/v1/crates/new");
        _validate_upload(
            &new_path,
            expected_json,
            expected_crate_name,
            expected_files,
            expected_contents,
        );
    }

    /// Checks the result of a crate publish to an alternative registry.
    pub fn validate_alt_upload(
        expected_json: &str,
        expected_crate_name: &str,
        expected_files: &[&str],
    ) {
        let new_path = alt_api_path().join("api/v1/crates/new");
        _validate_upload(
            &new_path,
            expected_json,
            expected_crate_name,
            expected_files,
            &[],
        );
    }

    fn _validate_upload(
        new_path: &Path,
        expected_json: &str,
        expected_crate_name: &str,
        expected_files: &[&str],
        expected_contents: &[(&str, &str)],
    ) {
        let mut f = File::open(new_path).unwrap();
        // 32-bit little-endian integer of length of JSON data.
        let json_sz = read_le_u32(&mut f).expect("read json length");
        let mut json_bytes = vec![0; json_sz as usize];
        f.read_exact(&mut json_bytes).expect("read JSON data");
        let actual_json = serde_json::from_slice(&json_bytes).expect("uploaded JSON should be valid");
        let expected_json = serde_json::from_str(expected_json).expect("expected JSON does not parse");

        if let Err(e) = find_json_mismatch(&expected_json, &actual_json, None) {
            panic!("{}", e);
        }

        // 32-bit little-endian integer of length of crate file.
        let crate_sz = read_le_u32(&mut f).expect("read crate length");
        let mut krate_bytes = vec![0; crate_sz as usize];
        f.read_exact(&mut krate_bytes).expect("read crate data");
        // Check at end.
        let current = f.seek(SeekFrom::Current(0)).unwrap();
        assert_eq!(f.seek(SeekFrom::End(0)).unwrap(), current);

        // Verify the tarball.
        validate_crate_contents(
            &krate_bytes[..],
            expected_crate_name,
            expected_files,
            expected_contents,
        );
    }

    /// Checks the contents of a `.crate` file.
    ///
    /// - `expected_crate_name` should be something like `foo-0.0.1.crate`.
    /// - `expected_files` should be a complete list of files in the crate
    ///   (relative to expected_crate_name).
    /// - `expected_contents` should be a list of `(file_name, contents)` tuples
    ///   to validate the contents of the given file. Only the listed files will
    ///   be checked (others will be ignored).
    pub fn validate_crate_contents(
        reader: impl Read,
        expected_crate_name: &str,
        expected_files: &[&str],
        expected_contents: &[(&str, &str)],
    ) {
        let mut rdr = GzDecoder::new(reader);
        assert_eq!(
            rdr.header().unwrap().filename().unwrap(),
            expected_crate_name.as_bytes()
        );
        let mut contents = Vec::new();
        rdr.read_to_end(&mut contents).unwrap();
        let mut ar = Archive::new(&contents[..]);
        let files: HashMap<PathBuf, String> = ar
            .entries()
            .unwrap()
            .map(|entry| {
                let mut entry = entry.unwrap();
                let name = entry.path().unwrap().into_owned();
                let mut contents = String::new();
                entry.read_to_string(&mut contents).unwrap();
                (name, contents)
            })
            .collect();
        assert!(expected_crate_name.ends_with(".crate"));
        let base_crate_name = Path::new(&expected_crate_name[..expected_crate_name.len() - 6]);
        let actual_files: HashSet<PathBuf> = files.keys().cloned().collect();
        let expected_files: HashSet<PathBuf> = expected_files
            .iter()
            .map(|name| base_crate_name.join(name))
            .collect();
        let missing: Vec<&PathBuf> = expected_files.difference(&actual_files).collect();
        let extra: Vec<&PathBuf> = actual_files.difference(&expected_files).collect();
        if !missing.is_empty() || !extra.is_empty() {
            panic!(
                "uploaded archive does not match.\nMissing: {:?}\nExtra: {:?}\n",
                missing, extra
            );
        }
        if !expected_contents.is_empty() {
            for (e_file_name, e_file_contents) in expected_contents {
                let full_e_name = base_crate_name.join(e_file_name);
                let actual_contents = files
                    .get(&full_e_name)
                    .unwrap_or_else(|| panic!("file `{}` missing in archive", e_file_name));
                assert_match_exact(e_file_contents, actual_contents);
            }
        }
    }

    pub(crate) fn create_index_line(
        name: serde_json::Value,
        vers: &str,
        deps: Vec<serde_json::Value>,
        cksum: &str,
        features: crate::registry::FeatureMap,
        yanked: bool,
        links: Option<String>,
        rust_version: Option<&str>,
        v: Option<u32>,
    ) -> String {
        // This emulates what crates.io does to retain backwards compatibility.
        let (features, features2) = split_index_features(features.clone());
        let mut json = serde_json::json!({
            "name": name,
            "vers": vers,
            "deps": deps,
            "cksum": cksum,
            "features": features,
            "yanked": yanked,
            "links": links,
        });
        if let Some(f2) = &features2 {
            json["features2"] = serde_json::json!(f2);
            json["v"] = serde_json::json!(2);
        }
        if let Some(v) = v {
            json["v"] = serde_json::json!(v);
        }
        if let Some(rust_version) = rust_version {
            json["rust_version"] = serde_json::json!(rust_version);
        }

        json.to_string()
    }

    pub(crate) fn write_to_index(registry_path: &Path, name: &str, line: String, local: bool) {
        let file = cargo_util::registry::make_dep_path(name, false);

        // Write file/line in the index.
        let dst = if local {
            registry_path.join("index").join(&file)
        } else {
            registry_path.join(&file)
        };
        let prev = fs::read_to_string(&dst).unwrap_or_default();
        t!(fs::create_dir_all(dst.parent().unwrap()));
        t!(fs::write(&dst, prev + &line[..] + "\n"));

        // Add the new file to the index.
        if !local {
            let repo = t!(git2::Repository::open(&registry_path));
            let mut index = t!(repo.index());
            t!(index.add_path(Path::new(&file)));
            t!(index.write());
            let id = t!(index.write_tree());

            // Commit this change.
            let tree = t!(repo.find_tree(id));
            let sig = t!(repo.signature());
            let parent = t!(repo.refname_to_id("refs/heads/master"));
            let parent = t!(repo.find_commit(parent));
            t!(repo.commit(
                Some("HEAD"),
                &sig,
                &sig,
                "Another commit",
                &tree,
                &[&parent]
            ));
        }
    }

    fn split_index_features(mut features: FeatureMap) -> (FeatureMap, Option<FeatureMap>) {
        let mut features2 = FeatureMap::new();
        for (feat, values) in features.iter_mut() {
            if values
                .iter()
                .any(|value| value.starts_with("dep:") || value.contains("?/"))
            {
                let new_values = values.drain(..).collect();
                features2.insert(feat.clone(), new_values);
            }
        }
        if features2.is_empty() {
            (features, None)
        } else {
            (features, Some(features2))
        }
    }