1 files changed, 24 insertions, 0 deletions
diff --git a/Controllers/ApiMediaController.cs b/Controllers/ApiMediaController.cs
index bb6c81e..8ca6121 100644
--- a/Controllers/ApiMediaController.cs
+++ b/Controllers/ApiMediaController.cs
@@ -5,6 +5,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using System.Text.Json;
+using System.Text.RegularExpressions;
 
 namespace HyperBooru.Controllers;
 
@@ -15,6 +16,9 @@ public class ApiMediaController : Controller {
     private IDbContextFactory<HBContext> dbFactory;
     private IMediaService                mediaService;
 
+    private readonly Regex checksumRegex =
+        new Regex("^[0-9a-f]{32}$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
     public ApiMediaController(IDbContextFactory<HBContext> dbFactory, IMediaService mediaService) {
         this.dbFactory    = dbFactory;
         this.mediaService = mediaService;
@@ -32,6 +36,26 @@ public class ApiMediaController : Controller {
         return Ok((ApiModels.Media) media);
     }
 
+    [HttpGet("checksum/{checksum}")]
+    public async Task<IActionResult> GetChecksum([FromRoute] string checksum) {
+        if(!checksumRegex.IsMatch(checksum))
+            throw new ApiModels.ArgumentException("Invalid checksum string");
+
+        using var db = dbFactory.CreateDbContext();
+
+        var media = await db.UploadedFiles
+            .Include(uf => uf.Media)
+            .Where(uf => uf.Checksum == checksum.ToLower())
+            .Select(uf => uf.Media)
+            .Distinct()
+            .ToArrayAsync();
+
+        if(media.Count() == 0)
+            throw new ObjectNotFoundException([ Guid.Empty ]);
+
+        return Ok(media.Select(m => (ApiModels.Media) m).ToArray());
+    }
+
     [HttpGet("{mediaId}/files")]
     public async Task<IActionResult> GetUploadedFiles([FromRoute] Guid mediaId) {
         using var db = dbFactory.CreateDbContext();