Create backend parser concept

backend/api/src/main/java/eu/okaeri/timings/api/IndexController.java

@@ -0,0 +1,13 @@
+package eu.okaeri.timings.api;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class IndexController {
+
+    @RequestMapping
+    public String index() {
+        return "redirect:/swagger-ui";
+    }
+}

backend/api/src/main/java/eu/okaeri/timings/api/security/SecurityConfig.java

@@ -0,0 +1,36 @@
+package eu.okaeri.timings.api.security;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+import org.springframework.web.filter.CorsFilter;
+
+import java.util.Arrays;
+import java.util.List;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig extends WebSecurityConfigurerAdapter {
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        http.httpBasic().disable();
+        http.csrf().disable();
+    }
+
+    @Bean
+    public CorsFilter corsFilter() {
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        CorsConfiguration config = new CorsConfiguration();
+        config.setAllowCredentials(true);
+        config.setAllowedOrigins(List.of("*"));
+        config.setAllowedHeaders(Arrays.asList("Origin", "Content-Type", "Accept", "Authorization"));
+        config.setAllowedMethods(List.of("*"));
+        source.registerCorsConfiguration("/**", config);
+        return new CorsFilter(source);
+    }
+}

backend/api/src/main/java/eu/okaeri/timings/api/v1/ParseController.java

@@ -0,0 +1,90 @@
+package eu.okaeri.timings.api.v1;
+
+import lombok.SneakyThrows;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.math.BigDecimal;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/v1/parse")
+public class ParseController {
+
+    @SneakyThrows
+    @PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
+    public ResponseEntity<?> parse(@RequestPart("file") MultipartFile file) {
+
+        if (!"text/csv".equals(file.getContentType())) {
+            return ResponseEntity.badRequest().body(Map.of("error", "Expected text/csv, got: " + file.getContentType()));
+        }
+
+        String content = new String(file.getBytes(), StandardCharsets.UTF_8);
+        String[] lines = content.split("\r?\n");
+
+        Map<String, String> metadata = new LinkedHashMap<>();
+        List<String> header = null;
+        List<List<BigDecimal>> records = new ArrayList<>();
+
+        for (String line : lines) {
+
+            // metadata
+            if (line.startsWith("#")) {
+                if (!line.contains(":")) {
+                    continue;
+                }
+                String[] parts = line.substring(1).split(":", 2);
+                if (parts.length != 2) {
+                    throw new RuntimeException("Cannot parse metadata: '" + line + "'");
+                }
+                String key = parts[0].trim().toLowerCase(Locale.ROOT);
+                String value = parts[1].trim();
+                metadata.put(key, value);
+                continue;
+            }
+
+            // header
+            if (header == null) {
+                String[] parts = line.split(",");
+                if (parts.length < 2) {
+                    throw new RuntimeException("Cannot parse header: '" + line + "'");
+                }
+                header = Arrays.asList(parts);
+                continue;
+            }
+
+            // data
+            String[] parts = line.split(",");
+            if (parts.length != header.size()) {
+                throw new RuntimeException("Cannot parse record: '" + line + "'");
+            }
+
+            records.add(Arrays.stream(parts)
+                .map(value -> {
+                    try {
+                        return new BigDecimal(value);
+                    } catch (Exception exception) {
+                        throw new RuntimeException("Cannot parse value: '" + value + "' from record '" + line + "'");
+                    }
+                })
+                .collect(Collectors.toList()));
+        }
+
+        if (header == null || records.size() < 2) {
+            throw new RuntimeException("Invalid report");
+        }
+
+        return ResponseEntity.ok(Map.of(
+            "meta", metadata,
+            "header", header,
+            "data", records
+        ));
+    }
+}

backend/api/src/main/resources/application.yml

@@ -20,9 +20,11 @@ springdoc:
   default-produces-media-type: "application/json"
 
 spring:
-  data:
-    rest:
-      base-path: /rest
+  servlet:
+    multipart:
+      enabled: true
+      max-file-size: 1MB
+      max-request-size: 1MB
   redis:
     host: 127.0.0.1
     port: 6379