Function genEspIdfFileHandler

src/cppCodeEspIdf.ts:4–111

(d: TemplateData, source: TransformedSource)

import { cacheCtrl, sw } from './cppCode';

const genEspIdfFileHandler = (d: TemplateData, source: TransformedSource): string => {
  const path = `${d.basePath}/${source.filename}`;
  const lines: string[] = [`static esp_err_t file_handler_${source.datanameUpperCase} (httpd_req_t *req)`, '{'];
  const etagCheck = sw(d.etag, {
    always: [
      `    size_t hdr_len = httpd_req_get_hdr_value_len(req, "If-None-Match");`,
      `    if (hdr_len > 0) {`,
      `        char* hdr_value = malloc(hdr_len + 1);`,
      `        if (hdr_value == NULL) { httpd_resp_send_500(req); return ESP_FAIL; }`,
      `        if (httpd_req_get_hdr_value_str(req, "If-None-Match", hdr_value, hdr_len + 1) == ESP_OK) {`,
      `            if (strcmp(hdr_value, etag_${source.dataname}) == 0) {`,
      `                free(hdr_value);`,
      `                httpd_resp_set_status(req, "304 Not Modified");`,
      `                ${d.definePrefix}_onFileServed("${path}", 304);`,
      `                httpd_resp_send(req, NULL, 0);`,
      `                return ESP_OK;`,
      `            }`,
      `        }`,
      `        free(hdr_value);`,
      `    }`
    ].join('\n'),
    compiler: [
      `  #ifdef ${d.definePrefix}_ENABLE_ETAG`,
      `    size_t hdr_len = httpd_req_get_hdr_value_len(req, "If-None-Match");`,
      `    if (hdr_len > 0) {`,
      `        char* hdr_value = malloc(hdr_len + 1);`,
      `        if (hdr_value == NULL) { httpd_resp_send_500(req); return ESP_FAIL; }`,
      `        if (httpd_req_get_hdr_value_str(req, "If-None-Match", hdr_value, hdr_len + 1) == ESP_OK) {`,
      `            if (strcmp(hdr_value, etag_${source.dataname}) == 0) {`,
      `                free(hdr_value);`,
      `                httpd_resp_set_status(req, "304 Not Modified");`,
      `                ${d.definePrefix}_onFileServed("${path}", 304);`,
      `                httpd_resp_send(req, NULL, 0);`,
      `                return ESP_OK;`,
      `            }`,
      `        }`,
      `        free(hdr_value);`,
      `    }`,
      `  #endif`
    ].join('\n')
  });
  if (etagCheck) lines.push(etagCheck);
  lines.push(`    httpd_resp_set_type(req, "${source.mime}");`);
  const gzipEncoding = sw(d.gzip, {
    always: source.isGzip ? `    httpd_resp_set_hdr(req, "Content-Encoding", "gzip");` : '',
    compiler: source.isGzip
      ? [
          `  #ifdef ${d.definePrefix}_ENABLE_GZIP`,
          `    httpd_resp_set_hdr(req, "Content-Encoding", "gzip");`,
          `  #endif`
        ].join('\n')
      : ''
  });
  if (gzipEncoding) lines.push(gzipEncoding);
  const cacheHeaders = sw(d.etag, {
    always: [
      `    httpd_resp_set_hdr(req, "Cache-Control", "${cacheCtrl(source)}");`,
      `    httpd_resp_set_hdr(req, "ETag", etag_${source.dataname});`