Merge pull request open-runtimes#123 from sahalsaad/feat-generate-inv…

…oice-java

Add generate_invoice example for java

java/generate_invoice/Index.java

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+import com.google.gson.Gson;
+import com.itextpdf.text.*;
+import com.itextpdf.text.pdf.PdfWriter;
+import com.itextpdf.text.pdf.draw.VerticalPositionMark;
+
+import java.io.ByteArrayOutputStream;
+import java.util.*;
+import java.util.List;
+
+final Gson gson = new Gson();
+
+public RuntimeResponse main(RuntimeRequest req, RuntimeResponse res) {
+ String payloadString = req.getPayload();
+ Map<String, Object> payload = gson.fromJson(payloadString, Map.class);
+ Map<String, Object> responseData = new HashMap<>();
+
+ try {
+ String currency = Objects.toString(payload.get("currency"), "");
+ List<Map<String, Object>> items = (List<Map<String, Object>>)(List<?>) payload.get("items");
+ String issuer = Objects.toString(payload.get("issuer"), "");
+ String customer = Objects.toString(payload.get("customer"), "");
+ Number vat = (Number) payload.get("vat");
+
+ List<String> errorFields = validatePayload(currency, items, issuer, customer, vat);
+ if (!errorFields.isEmpty()) {
+ throw new NoSuchFieldException("Please provide " + String.join(", ", errorFields));
+ }
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ Document doc = new Document();
+ PdfWriter writer = PdfWriter.getInstance(doc, baos);
+
+ doc.open();
+ Font font = new Font(Font.FontFamily.TIMES_ROMAN, 26, Font.BOLD | Font.UNDERLINE);
+ Paragraph invoice = new Paragraph("Invoice", font);
+ invoice.setAlignment(Element.ALIGN_CENTER);
+ doc.add(invoice);
+
+ font.setSize(12);
+ font.setStyle(Font.NORMAL);
+ doc.add(new Paragraph(50));
+ doc.add(new Paragraph("Issuer: " + issuer, font));
+ doc.add(new Paragraph("Customer: " + customer, font));
+ doc.add(new Paragraph("Currency: " + currency, font));
+ doc.add(new Paragraph("VAT: " + vat, font));
+
+ Chunk glue = new Chunk(new VerticalPositionMark());
+ Chunk rightChunk = new Chunk(glue);
+
+ font.setStyle(Font.BOLD);
+ Paragraph itemHeader = new Paragraph(50, "Item", font);
+ itemHeader.add(rightChunk);
+ itemHeader.add("Price");
+ doc.add(itemHeader);
+
+ font.setStyle(Font.NORMAL);
+ double total = 0;
+ for (Map<String, Object> item : items) {
+ String name = item.get("name").toString();
+ double price = (double) item.get("price");
+
+ total += price;
+ Paragraph itemParagraph = new Paragraph(name, font);
+ itemParagraph.add(rightChunk);
+ itemParagraph.add(String.valueOf(price));
+ doc.add(itemParagraph);
+ }
+
+ font.setStyle(Font.UNDERLINE | Font.BOLD);
+ font.setSize(15);
+ Paragraph totalParagraph = new Paragraph(20, "Total:", font);
+ totalParagraph.add(rightChunk);
+ totalParagraph.add(String.valueOf(total));
+ doc.add(totalParagraph);
+ doc.close();
+ writer.close();
+
+ String base64String = Base64.getEncoder().encodeToString(baos.toByteArray());
+
+ responseData.put("success", true);
+ responseData.put("invoice", base64String);
+
+ return res.json(responseData);
+ } catch (DocumentException | NoSuchFieldException exception) {
+ responseData.put("success", false);
+ responseData.put("message", exception.getMessage());
+ return res.json(responseData);
+ }
+}
+
+private List<String> validatePayload(String currency, List<Map<String, Object>> items, String issuer, String customer, Number vat) {
+
+ List<String> errors = new ArrayList<>();
+
+ if (currency.isEmpty()) {
+ errors.add("currency");
+ }
+
+ if (items == null || items.isEmpty()) {
+ errors.add("items");
+ }
+
+ if (issuer.isEmpty()) {
+ errors.add("issuer");
+ }
+
+ if (customer.isEmpty()) {
+ errors.add("customer");
+ }
+
+ if (vat == null) {
+ errors.add("vat");
+ }
+
+ return errors;
+}

java/generate_invoice/README.md

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+# 💻 Generate invoice
+
+A Java Cloud Function for generating invoice.
+
+```json
+{
+ "currency":"EUR",
+ "items":[{"name":"Web development","price":15}],
+ "issuer":"Some\nIssuer",
+ "customer":"Some\nCustomer",
+ "vat":21
+}
+```
+
+_Example output:_
+
+
+```json
+{
+ "success":true,
+ "invoice":"iVBORw0KGgoAAAANSUhEUgAAAaQAAALiCAY...QoH9hbkTPQAAAABJRU5ErkJggg=="
+}
+```
+
+_Error Example output:_
+
+```json
+{
+ "success": false,
+ "message":"Please provide currency"
+}
+```
+
+
+## 📝 Environment Variables
+
+This function does not require any variables.
+
+## 🚀 Deployment
+
+1. Clone this repository, and enter this function folder:
+
+```
+$ git clone https://github.com/open-runtimes/examples.git && cd examples
+$ cd java/generate_invoice
+```
+
+2. Enter this function folder and build the code:
+```
+docker run -e INTERNAL_RUNTIME_ENTRYPOINT=Index.java --rm --interactive --tty --volume $PWD:/usr/code openruntimes/java:v2-18.0 sh /usr/local/src/build.sh
+```
+As a result, a `code.tar.gz` file will be generated.
+
+3. Start the Open Runtime:
+```
+docker run -p 3000:3000 -e INTERNAL_RUNTIME_KEY=secret-key --rm --interactive --tty --volume $PWD/code.tar.gz:/tmp/code.tar.gz:ro openruntimes/java:v2-18.0 sh /usr/local/src/start.sh
+```
+
+Your function is now listening on port `3000`, and you can execute it by sending `POST` request with appropriate authorization headers. To learn more about runtime, you can visit Java runtime [README](https://github.com/open-runtimes/open-runtimes/tree/main/runtimes/java-18.0).
+
+4. Execute function:
+
+```
+curl http:https://localhost:3000/ -d '{"payload":"{\"currency\":\"EUR\",\"items\":[{\"name\":\"Web development\",\"price\":15}],\"issuer\":\"Some\nIssuer\",\"customer\":\"Some\nCustomer\",\"vat\":21}"}' -H "X-Internal-Challenge: secret-key" -H "Content-Type: application/json"
+```
+
+## 📝 Notes
+ - This function is designed for use with Appwrite Cloud Functions. You can learn more about it in [Appwrite docs](https://appwrite.io/docs/functions).
+ - This example is compatible with Java 18.0. Other versions may work but are not guarenteed to work as they haven't been tested.

java/generate_invoice/deps.gradle

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+dependencies {
+ implementation 'com.google.code.gson:gson:2.9.0'
+ implementation 'com.itextpdf:itextpdf:5.5.13.3'
+}