From 8da473460c3f82737ff34d02006ceac4c289243c Mon Sep 17 00:00:00 2001
From: "Adam T. Carpenter" <atc@53hor.net>
Date: Sat, 3 Oct 2020 22:07:39 -0400
Subject: broke out functions, wrote more tests, added test data

---
 dichroism/src/image_api.rs | 42 +++++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 17 deletions(-)

(limited to 'dichroism/src/image_api.rs')

diff --git a/dichroism/src/image_api.rs b/dichroism/src/image_api.rs
index d1649d5..44effe4 100644
--- a/dichroism/src/image_api.rs
+++ b/dichroism/src/image_api.rs
@@ -1,3 +1,4 @@
+use crate::error::DichroismError;
 use crate::result::Result;
 use base64::decode;
 use regex::Regex;
@@ -7,34 +8,41 @@ lazy_static! {
         Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)").expect("Couldn't parse Regex!");
 }
 
-pub fn data_uri_to_files(uri: &str) -> Result<()> {
-    let caps = if let Some(c) = DATA_URI_RE.captures(uri) {
-        c
-    } else {
-        todo!();
-    };
-
-    let data = caps
-        .name("data")
-        .expect("Data URI data extraction should never fail.")
-        .as_str();
-
+pub fn generate_images(data: &str) -> Result<()> {
     let bytes = decode(data)?;
     let img = image::load_from_memory(&bytes)?;
-    img.save("test_full.jpg")?;
-    let thumb = img.thumbnail(200, 200);
-    thumb.save("test_thumbnail.jpg")?;
+    //img.save("test_full.jpg")?;
+    let _thumb = img.thumbnail(200, 200);
+    //thumb.save("test_thumbnail.jpg")?;
     Ok(())
 }
 
+pub fn extract_data(uri: &str) -> Result<&str> {
+    let caps = DATA_URI_RE
+        .captures(uri)
+        .ok_or(DichroismError::UriDataExtract)?;
+
+    Ok(caps
+        .name("data")
+        .expect("Should never fail if regex succeeded")
+        .as_str())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     const TEST_DATA_URI: &str = include_str!("unit_test_data/img_data_uri.txt");
+    const TEST_DATA_BASE64: &str = include_str!("unit_test_data/test_data_base64.txt");
+
+    #[test]
+    fn test_generate_images() {
+        generate_images(TEST_DATA_BASE64.trim()).unwrap();
+    }
 
     #[test]
-    fn test_data_uri_to_files() {
-        data_uri_to_files(TEST_DATA_URI).unwrap();
+    fn test_extract_data() {
+        let base64_data = extract_data(TEST_DATA_URI).unwrap();
+        assert_eq!(TEST_DATA_BASE64.trim(), base64_data);
     }
 }
-- 
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