1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
* Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
*
* Use of this source code is governed by the Apache 2.0 and/or the MIT
* License.
*/

use std::io::Error;
use std::path::Path;
use std::{fs, path::PathBuf};

use derive_builder::Builder;
use walkdir::WalkDir;

use crate::map::Files;

#[derive(Debug, Clone, Builder)]
pub struct Buster {
    // source directory
    #[builder(setter(into))]
    source: String,
    // mime_types for hashing
    mime_types: Vec<mime::Mime>,
    // directory for writing results
    #[builder(setter(into))]
    result: String,
    // copy other non-hashed files from source dire to result dir?
    copy: bool,
    follow_links: bool,
}

impl Buster {
    pub fn init(&self) -> Result<(), Error> {
        let res = Path::new(&self.result);
        if res.exists() {
            fs::remove_dir_all(&self.result).unwrap();
        }

        fs::create_dir(&self.result).unwrap();
        self.create_dir_structure(Path::new(&self.source))?;
        Ok(())
    }

    fn hasher(payload: &[u8]) -> String {
        use data_encoding::HEXUPPER;
        use sha2::{Digest, Sha256};
        let mut hasher = Sha256::new();
        hasher.update(payload);
        HEXUPPER.encode(&hasher.finalize())
    }

    // if mime types are common, then you shoud be fine using this
    // use [hash] when when they aren't
    //
    // doesn't process files for which mime is not resolved
    pub fn try_hash(&self) -> Result<Files, Error> {
        let mut file_map: Files = Files::default();
        for entry in WalkDir::new(&self.source)
            .follow_links(self.follow_links)
            .into_iter()
        {
            let entry = entry?;
            let path = entry.path();
            let path = Path::new(&path);

            for mime_type in self.mime_types.iter() {
                if let Some(file_mime) = mime_guess::from_path(path).first() {
                    if &file_mime == mime_type {
                        let contents = Self::read_to_string(&path).unwrap();
                        let hash = Self::hasher(&contents);
                        let new_name = format!(
                            "{}.{}.{}",
                            path.file_stem().unwrap().to_str().unwrap(),
                            hash,
                            path.extension().unwrap().to_str().unwrap()
                        );
                        self.copy(path, &new_name);

                        let (source, destination) = self.gen_map(path, &&new_name);
                        let _ = file_map.add(
                            source.to_str().unwrap().into(),
                            destination.to_str().unwrap().into(),
                        );
                    }
                }
            }
        }

        Ok(file_map)
    }

    // panics when mimetypes are detected. This way you'll know which files are ignored
    // from processing
    pub fn hash(&self) -> Result<Files, Error> {
        let mut file_map: Files = Files::default();

        for entry in WalkDir::new(&self.source)
            .follow_links(self.follow_links)
            .into_iter()
        {
            let entry = entry?;

            let path = entry.path();
            if !path.is_dir() {
                let path = Path::new(&path);

                for mime_type in self.mime_types.iter() {
                    let file_mime = mime_guess::from_path(path)
                        .first()
                        .expect(&format!("couldn't resolve MIME for file: {:?}", &path));
                    if &file_mime == mime_type {
                        let contents = Self::read_to_string(&path).unwrap();
                        let hash = Self::hasher(&contents);
                        let new_name = format!(
                            "{}.{}.{}",
                            path.file_stem().unwrap().to_str().unwrap(),
                            hash,
                            path.extension().unwrap().to_str().unwrap()
                        );
                        self.copy(path, &new_name);
                        let (source, destination) = self.gen_map(path, &&new_name);
                        let _ = file_map.add(
                            source.to_str().unwrap().into(),
                            destination.to_str().unwrap().into(),
                        );
                    }
                }
            }
        }

        Ok(file_map)
    }

    fn read_to_string(path: &Path) -> Result<Vec<u8>, Error> {
        use std::fs::File;
        use std::io::Read;

        let mut file_content = Vec::new();
        let mut file = File::open(path)?;
        file.read_to_end(&mut file_content).expect("Unable to read");
        Ok(file_content)
    }

    fn gen_map<'a>(&self, source: &'a Path, name: &str) -> (&'a Path, PathBuf) {
        let rel_location = source.strip_prefix(&self.source).unwrap().parent().unwrap();
        let destination = Path::new(&self.result).join(rel_location).join(name);
        (source, destination)
    }

    fn copy(&self, source: &Path, name: &str) {
        let rel_location = source.strip_prefix(&self.source).unwrap().parent().unwrap();
        let destination = Path::new(&self.result).join(rel_location).join(name);
        fs::copy(source, &destination).unwrap();
    }

    fn create_dir_structure(&self, path: &Path) -> Result<(), Error> {
        for entry in WalkDir::new(&path)
            .follow_links(self.follow_links)
            .into_iter()
        {
            let entry = entry?;
            let entry_path = entry.path();
            let entry_path = Path::new(&entry_path);

            if entry_path.is_dir() && path != entry_path {
                Self::create_dir_structure(&self, entry_path)?;
            } else {
                if entry_path.is_dir() {
                    let rel_location = entry_path.strip_prefix(&self.source).unwrap();
                    let destination = Path::new(&self.result).join(rel_location);
                    if !destination.exists() {
                        fs::create_dir(destination)?
                    }
                }
            }
        }
        Ok(())
    }
}

#[cfg(test)]
pub mod tests {
    use super::*;

    #[test]
    fn hasher_works() {
        let types = vec![
            mime::IMAGE_PNG,
            mime::IMAGE_SVG,
            mime::IMAGE_JPEG,
            mime::IMAGE_GIF,
        ];

        let config = BusterBuilder::default()
            .source("./dist")
            .result("./prod")
            .mime_types(types)
            .copy(true)
            .follow_links(true)
            .build()
            .unwrap();

        config.init().unwrap();
        let mut files = config.hash().unwrap();

        for (k, v) in files.map.drain() {
            let src = Path::new(&k);
            let dest = Path::new(&v);

            assert_eq!(src.exists(), dest.exists());
        }
        cleanup(&config);
    }

    #[test]
    fn try_hash_works() {
        let types = vec![
            mime::IMAGE_PNG,
            mime::IMAGE_SVG,
            mime::IMAGE_JPEG,
            mime::IMAGE_GIF,
        ];

        let config = BusterBuilder::default()
            .source("./dist")
            .result("/tmp/prod")
            .mime_types(types)
            .copy(true)
            .follow_links(true)
            .build()
            .unwrap();

        config.init().unwrap();
        let mut files = config.try_hash().unwrap();

        for (k, v) in files.map.drain() {
            let src = Path::new(&k);
            let dest = Path::new(&v);

            assert_eq!(src.exists(), dest.exists());
        }

        cleanup(&config);
    }

    pub fn cleanup(config: &Buster) {
        let _ = fs::remove_dir_all(&config.result);
    }
}