Implement `put_posts`.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/database.rs b/src/database.rs
index 7b69a21..db33117 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -16,7 +16,9 @@
 // License along with бирка-тян. If not, see <http://www.gnu.org/licenses/>.
 
 use anyhow::Result;
+use blake2::{Blake2b, Digest};
 use rusqlite::{params, Connection};
+use std::io;
 use std::path::Path;
 
 /// A connection to бирка-тян's tag database.
@@ -185,8 +187,8 @@ impl TagDatabase {
                         let (n, id) = pair;
                         format!(
                             "INNER JOIN mapping as m{n}
-                         ON images.id = m{n}.image
-                         AND {id} = m{n}.tag",
+                             ON images.id = m{n}.image
+                             AND {id} = m{n}.tag",
                             n = n,
                             id = id
                         )
@@ -263,6 +265,14 @@ pub struct Image {
     pub orig_dir: String,
 }
 
+/// Return a base64-encoded BLAKE2b hash identifying the file at `path`.
+pub fn hash_file(path: &Path) -> Result<String> {
+    let mut file = std::fs::File::open(path)?;
+    let mut hasher = Blake2b::new();
+    io::copy(&mut file, &mut hasher)?;
+    Ok(base64::encode(&hasher.result()))
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;