src/server/plugins/postgresql/service.c

changeset 385
a1f4cb076d2f
parent 278
38bf7b42b58c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/server/plugins/postgresql/service.c	Sat Sep 24 16:26:10 2022 +0200
@@ -0,0 +1,113 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2022 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "service.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "resource.h"
+
+int pg_query(pblock *pb, Session *sn, Request *rq) {
+    char *respool = pblock_findval("resource", pb);
+    char *query = pblock_findval("query", pb);
+    
+    if(!respool) {
+        log_ereport(LOG_MISCONFIG, "pg-query: missing resource parameter");
+        return REQ_ABORTED;
+    }
+    if(!query) {
+        log_ereport(LOG_MISCONFIG, "pg-query: missing query parameter");
+        return REQ_ABORTED;
+    }
+    
+    // Get the named resource and check if the PG connection works
+    ResourceData *res = resourcepool_lookup(sn, rq, respool, 0);
+    if(!res) {
+        log_ereport(LOG_FAILURE, "pg-query: cannot get resource '%s'", respool);
+        return REQ_ABORTED;
+    }
+    
+    PGconn *connection = res->data;
+    if(pg_check_connection(LOG_FAILURE, respool, connection)) {
+        return REQ_ABORTED;
+    }
+    
+    // execute query
+    PGresult *result = PQexec(connection, query);
+    if(!result) return REQ_ABORTED;
+    
+    // start response
+    pblock_remove("content-type", rq->srvhdrs);
+    pblock_nvinsert("content-type", "text/html", rq->srvhdrs);
+    
+    protocol_status(sn, rq, 200, NULL);
+    http_start_response(sn, rq);
+    
+    // (html) header
+    net_printf(sn->csd, "%s", "<!DOCTYPE html>\n<html><head></head><body>\n");
+    
+    int nfields = PQnfields(result);
+    if(nfields > 0) {
+        net_printf(sn->csd, "<table>\n<tr>\n");
+        for(int i=0;i<nfields;i++) {
+            char *fieldName = PQfname(result, i);
+            char *fieldNameEscaped = util_html_escape(fieldName);
+            if(fieldNameEscaped) {
+                net_printf(sn->csd, "<th>%s</th>\n", fieldNameEscaped);
+                FREE(fieldNameEscaped);
+            }
+        }
+        net_printf(sn->csd, "</tr>\n");
+        
+        int nrows = PQntuples(result);
+        for(int r=0;r<nrows;r++) {
+            net_printf(sn->csd, "<tr>\n");
+            for(int c=0;c<nfields;c++) {
+                char *fieldValue = PQgetvalue(result, r, c);
+                char *fieldValueEscaped = util_html_escape(fieldValue);
+                if(fieldValueEscaped) {
+                    net_printf(sn->csd, "<td>%s</td>\n", fieldValueEscaped);
+                    FREE(fieldValueEscaped);
+                }
+            }
+            net_printf(sn->csd, "</tr>\n");
+        }
+        
+        
+        net_printf(sn->csd, "</table>\n");
+    } else {
+        net_printf(sn->csd, "<p>%s</p>\n", PQresStatus(PQresultStatus(result)));
+    }
+    
+    net_printf(sn->csd, "%s", "</body></html>\n");
+    
+    PQclear(result);
+    
+    return REQ_PROCEED;
+}

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