added hint to .env file when calling the program

README.md

@@ -25,3 +25,5 @@ Generated description: Aerial view of a circular lake surrounded by dense forest
 Successfully uploaded image to WordPress with description
 Image URL: https://example.wordpress.com/wp-content/uploads/2024/11/DJI_0247-scaled.jpg
 ```
+
+Hint: make sure that the `.env` file is located in $PWD when calling the script

src/main.rs

@@ -3,7 +3,7 @@ use reqwest::{self, multipart};
 use serde_json::{json, Value};
 use std::env;
 use std::error::Error;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use tokio;
 use base64::{Engine as _, engine::general_purpose::STANDARD};
 
@@ -32,6 +32,38 @@ impl Config {
     }
 }
 
+fn validate_image_path(path_str: &str) -> Result<PathBuf, Box<dyn Error>> {
+    let path = PathBuf::from(path_str);
+    
+    // Check if path exists
+    if !path.exists() {
+        return Err(format!("Image path does not exist: {}", path_str).into());
+    }
+
+    // Check if it's a file
+    if !path.is_file() {
+        return Err(format!("Path is not a file: {}", path_str).into());
+    }
+
+    // Check file extension
+    match path.extension().and_then(|ext| ext.to_str()) {
+        Some(ext) => {
+            let lower_ext = ext.to_lowercase();
+            if !["jpg", "jpeg", "png", "gif"].contains(&lower_ext.as_str()) {
+                return Err(format!("Unsupported file type: {}", ext).into());
+            }
+        }
+        None => return Err("File has no extension".into()),
+    }
+
+    // Try to canonicalize the path (resolve symlinks and normalize)
+    let canonical_path = path.canonicalize()
+        .map_err(|e| format!("Failed to resolve path: {}", e))?;
+
+    println!("Using image file: {}", canonical_path.display());
+    Ok(canonical_path)
+}
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     // Get image path from command line arguments
@@ -40,24 +72,29 @@ async fn main() -> Result<(), Box<dyn Error>> {
         eprintln!("Usage: {} <image_path>", args[0]);
         std::process::exit(1);
     }
-    let image_path = &args[1];
+    
+    // Validate and normalize the image path
+    let image_path = validate_image_path(&args[1])?;
 
     // Load configuration
     let config = Config::from_env()?;
 
     // Get image description from ChatGPT
-    let description = get_image_description(&config, image_path).await?;
+    let description = get_image_description(&config, &image_path).await?;
     println!("Generated description: {}", description);
 
     // Upload image to WordPress and set ALT text
-    upload_to_wordpress(&config, image_path, &description).await?;
+    upload_to_wordpress(&config, &image_path, &description).await?;
 
     Ok(())
 }
 
-async fn get_image_description(config: &Config, image_path: &str) -> Result<String, Box<dyn Error>> {
+async fn get_image_description(config: &Config, image_path: &Path) -> Result<String, Box<dyn Error>> {
     // Read and encode image
-    let image_data = std::fs::read(image_path)?;
+    let image_data = tokio::fs::read(image_path)
+        .await
+        .map_err(|e| format!("Failed to read image file: {}", e))?;
+    
     let base64_image = STANDARD.encode(&image_data);
 
     // Create ChatGPT API request
@@ -67,7 +104,7 @@ async fn get_image_description(config: &Config, image_path: &str) -> Result<Stri
         .header("Authorization", format!("Bearer {}", config.openai_api_key))
         .header("Content-Type", "application/json")
         .json(&json!({
-            "model": config.openai_model,  // Now using the model from config
+            "model": config.openai_model,
             "max_tokens": 300,
             "messages": [
                 {
@@ -112,12 +149,15 @@ async fn get_image_description(config: &Config, image_path: &str) -> Result<Stri
 
 async fn upload_to_wordpress(
     config: &Config,
-    image_path: &str,
+    image_path: &Path,
     description: &str,
 ) -> Result<(), Box<dyn Error>> {
     let client = reqwest::Client::new();
-    let file_data = tokio::fs::read(image_path).await?;
-    let filename = Path::new(image_path)
+    let file_data = tokio::fs::read(image_path)
+        .await
+        .map_err(|e| format!("Failed to read image for upload: {}", e))?;
+        
+    let filename = image_path
         .file_name()
         .ok_or("Invalid filename")?
         .to_str()