added custom id generator

src/main/java/id/my/luxic/pastebin/controller/PasteController.java

@@ -9,6 +9,7 @@ import org.springframework.web.bind.annotation.*;
 import java.util.List;
 
 @RestController
+@RequestMapping(value = "/api/paste")
 public class PasteController {
 
     private final PasteService service;
@@ -17,17 +18,17 @@ public class PasteController {
         this.service = service;
     }
 
-    @GetMapping("/api/paste/findAll")
+    @GetMapping(value = "/findAll")
     public ResponseEntity<List<Paste>> findAll() {
         return ResponseEntity.ok(service.findAll());
     }
 
-    @PostMapping("/api/paste/create")
+    @PostMapping(value = "/create")
     public ResponseEntity<Paste> create(@RequestBody PasteCreateRequest pasteCreateRequest) {
         return ResponseEntity.ok(service.save(pasteCreateRequest));
     }
 
-    @GetMapping("/api/paste/{id}")
+    @GetMapping("/{id}")
     public ResponseEntity<Paste> findById(@PathVariable String id) {
         return ResponseEntity.ok(service.findById(id));
     }

src/main/java/id/my/luxic/pastebin/service/impl/PasteServiceImpl.java

@@ -4,21 +4,41 @@ import id.my.luxic.pastebin.model.Paste;
 import id.my.luxic.pastebin.repository.PasteRepository;
 import id.my.luxic.pastebin.request.PasteCreateRequest;
 import id.my.luxic.pastebin.service.PasteService;
-import org.apache.commons.lang3.RandomStringUtils;
+import org.apache.commons.lang3.RandomUtils;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.stream.Collector;
+import java.util.stream.Stream;
 
 @Service
 public class PasteServiceImpl implements PasteService {
 
+    private final String BASE64_CHARSET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    private final int BASE64_LENGTH = 64;
+
     private final PasteRepository repository;
 
     public PasteServiceImpl(PasteRepository repository) {
         this.repository = repository;
     }
 
+    private String generateId(int length) {
+        String id = Stream.generate(() -> BASE64_CHARSET.charAt(RandomUtils.secure().randomInt(0, BASE64_LENGTH)))
+                .limit(10)
+                .collect(Collector.of(
+                        StringBuilder::new,
+                        StringBuilder::append,
+                        StringBuilder::append,
+                        StringBuilder::toString
+                ));
+
+        if (repository.existsById(id)) id = generateId(length);
+
+        return id;
+    }
+
     @Override
     public Paste findById(String id) {
         return repository.findById(id).orElse(null);
@@ -33,7 +53,7 @@ public class PasteServiceImpl implements PasteService {
     public Paste save(PasteCreateRequest pasteCreateRequest) {
 
         Paste paste = Paste.builder()
-                .id(RandomStringUtils.secure().nextAlphanumeric(10))
+                .id(generateId(10))
                 .title(pasteCreateRequest.getTitle())
                 .content(pasteCreateRequest.getContent())
                 .isPrivate(pasteCreateRequest.getIsPrivate())