Adds image retrieval endpoint

src/main/kotlin/net/halfbinary/scavengerhuntapi/controller/PhotoController.kt

@@ -0,0 +1,29 @@
+package net.halfbinary.scavengerhuntapi.controller
+
+import io.swagger.v3.oas.annotations.Operation
+import net.halfbinary.scavengerhuntapi.model.ImageVersion
+import net.halfbinary.scavengerhuntapi.model.PhotoId
+import net.halfbinary.scavengerhuntapi.service.PhotoService
+import org.springframework.core.io.InputStreamSource
+import org.springframework.http.ResponseEntity
+import org.springframework.security.core.Authentication
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("photo")
+class PhotoController(private val photoService: PhotoService) {
+    @GetMapping("/{photoId}/file")
+    @Operation(summary = "Get the binary image information for the specified Photo")
+    fun getPhoto(authentication: Authentication,
+                 @PathVariable photoId: PhotoId,
+                 @RequestParam(defaultValue = "LARGE") version: ImageVersion): ResponseEntity<InputStreamSource> {
+        val photoFile = photoService.getPhotoFile(photoId, authentication.name, version)
+        return ResponseEntity.ok()
+            .contentType(photoFile.contentType)
+            .body(photoFile.resource)
+    }
+}