fix: switch from temporary to permanent file storage

resolves #2187

Author: jo-elimu

src/main/java/ai/elimu/rest/v2/analytics/LetterAssessmentEventsRestController.java

@@ -17,6 +17,7 @@
 import org.apache.commons.csv.CSVFormat;
 import org.apache.commons.csv.CSVParser;
 import org.apache.commons.csv.CSVRecord;
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -83,7 +84,8 @@ public String handleUploadCsvRequest(
       letterAssessmentEventsDir.mkdirs();
       File csvFile = new File(letterAssessmentEventsDir, originalFilename);
       log.info("Storing CSV file at " + csvFile);
-      multipartFile.transferTo(csvFile);
+      FileUtils.writeByteArrayToFile(csvFile, bytes);
+      log.info("csvFile.exists(): " + csvFile.exists());
 
       // Iterate each row in the CSV file
       Path csvFilePath = Paths.get(csvFile.toURI());

src/main/java/ai/elimu/rest/v2/analytics/LetterSoundLearningEventsRestController.java

@@ -6,6 +6,8 @@
 import java.io.File;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
+
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -68,7 +70,7 @@ public String handleUploadCsvRequest(
             letterSoundLearningEventsDir.mkdirs();
             File csvFile = new File(letterSoundLearningEventsDir, originalFilename);
             log.info("Storing CSV file at " + csvFile);
-            multipartFile.transferTo(csvFile);
+            FileUtils.writeByteArrayToFile(csvFile, bytes);
             log.info("csvFile.exists(): " + csvFile.exists());
 
             jsonResponseObject.put("result", "success");

src/main/java/ai/elimu/rest/v2/analytics/StoryBookLearningEventsRestController.java

@@ -6,6 +6,8 @@
 import java.io.File;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
+
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -68,7 +70,7 @@ public String handleUploadCsvRequest(
             storyBookLearningEventsDir.mkdirs();
             File csvFile = new File(storyBookLearningEventsDir, originalFilename);
             log.info("Storing CSV file at " + csvFile);
-            multipartFile.transferTo(csvFile);
+            FileUtils.writeByteArrayToFile(csvFile, bytes);
             log.info("csvFile.exists(): " + csvFile.exists());
 
             jsonResponseObject.put("result", "success");

src/main/java/ai/elimu/rest/v2/analytics/VideoLearningEventsRestController.java

@@ -6,6 +6,8 @@
 import java.io.File;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
+
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -68,7 +70,7 @@ public String handleUploadCsvRequest(
             videoLearningEventsDir.mkdirs();
             File csvFile = new File(videoLearningEventsDir, originalFilename);
             log.info("Storing CSV file at " + csvFile);
-            multipartFile.transferTo(csvFile);
+            FileUtils.writeByteArrayToFile(csvFile, bytes);
             log.info("csvFile.exists(): " + csvFile.exists());
 
             jsonResponseObject.put("result", "success");

src/main/java/ai/elimu/rest/v2/analytics/WordAssessmentEventsRestController.java

@@ -17,6 +17,7 @@
 import org.apache.commons.csv.CSVFormat;
 import org.apache.commons.csv.CSVParser;
 import org.apache.commons.csv.CSVRecord;
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -83,7 +84,8 @@ public String handleUploadCsvRequest(
       wordAssessmentEventsDir.mkdirs();
       File csvFile = new File(wordAssessmentEventsDir, originalFilename);
       log.info("Storing CSV file at " + csvFile);
-      multipartFile.transferTo(csvFile);
+      FileUtils.writeByteArrayToFile(csvFile, bytes);
+      log.info("csvFile.exists(): " + csvFile.exists());
 
       // Iterate each row in the CSV file
       Path csvFilePath = Paths.get(csvFile.toURI());

src/main/java/ai/elimu/rest/v2/analytics/WordLearningEventsRestController.java

@@ -6,6 +6,8 @@
 import java.io.File;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
+
+import org.apache.commons.io.FileUtils;
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -68,7 +70,7 @@ public String handleUploadCsvRequest(
             wordLearningEventsDir.mkdirs();
             File csvFile = new File(wordLearningEventsDir, originalFilename);
             log.info("Storing CSV file at " + csvFile);
-            multipartFile.transferTo(csvFile);
+            FileUtils.writeByteArrayToFile(csvFile, bytes);
             log.info("csvFile.exists(): " + csvFile.exists());
 
             jsonResponseObject.put("result", "success");