dav/propfind.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2012 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "utils.h"
#include "propfind.h"

Propfind* dav_propfind(CURL *handle) {
    Propfind *response = malloc(sizeof(Propfind));
    response->resource = NULL;
    response->children = NULL;
    
    curl_easy_setopt(handle, CURLOPT_CUSTOMREQUEST, "PROPFIND");
    
    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "Content-Type: text/xml");
    curl_easy_setopt(handle, CURLOPT_HTTPHEADER, headers);
    
    UcxBuffer *rqbuf = create_propfind_request_body();
    UcxBuffer *rpbuf = ucx_buffer_new(NULL, 4096, UCX_BUFFER_AUTOEXTEND);
    //printf("request\n%s\n", body->space);
    
    curl_easy_setopt(handle, CURLOPT_UPLOAD, 1); 
    curl_easy_setopt(handle, CURLOPT_READFUNCTION, ucx_buffer_read);
    curl_easy_setopt(handle, CURLOPT_READDATA, rqbuf); 
    curl_easy_setopt(handle, CURLOPT_INFILESIZE, rqbuf->size);
    
    curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, ucx_buffer_write);
    curl_easy_setopt(handle, CURLOPT_WRITEDATA, rpbuf);
    
    ucx_buffer_seek(rqbuf, 0, SEEK_SET);
    CURLcode res = curl_easy_perform(handle);
    if(res == CURLE_OK) {
        //printf("response\n%s\n", rpbuf->space);
        
        char *url = NULL;
        curl_easy_getinfo(handle, CURLINFO_EFFECTIVE_URL, &url);
        response->url = util_url_path(url);
        
        parse_propfind(response, rpbuf);
        
        response->url = strdup(url);
    }
    curl_easy_reset(handle);
    
    return response;
}

UcxBuffer* create_propfind_request_body() {
    UcxBuffer *buf = ucx_buffer_new(NULL, 512, 0);
    sstr_t s;
    
    s = ST("<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("<D:propfind xmlns:D=\"DAV:\">\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("<D:prop>\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("<D:creationdate />\n<D:getlastmodified />\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("<D:getcontentlength />\n<D:getcontenttype />\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("<D:resourcetype />\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    s = ST("</D:prop>\n</D:propfind>\n");
    ucx_buffer_write(s.ptr, 1, s.length, buf);
    
    return buf;
}

int parse_propfind(Propfind *propfind, UcxBuffer *response) {
    xmlTextReaderPtr reader = xmlReaderForMemory(
            response->space,
            response->size,
            propfind->url,
            NULL,
            0);
    
    int ret = 0;
    if(reader != NULL) {
        int r;
        while((r = xmlTextReaderRead(reader)) == 1) {
            int nodetype = xmlTextReaderNodeType(reader);
            if(nodetype == XML_READER_TYPE_ELEMENT) {
                const xmlChar *name = xmlTextReaderConstLocalName(reader);
                if(!xmlStrcmp(name, BAD_CAST "response")) {
                    r = parse_response(reader, propfind);
                    if(r != 0) {
                        ret = -1;
                        break;
                    }
                }
            }
        }
        xmlFreeTextReader(reader);
    }
    
    return ret;
}

int parse_response(xmlTextReaderPtr reader, Propfind *propfind) {
    DavResource *res = calloc(sizeof(DavResource), 1);
    if(res == NULL) {
        return -1;
    }
    
    /*
     * 0: href
     * 1: creationdate
     * 2: getlastmodified
     * 3: getcontentlength
     * 4: getcontenttype
     * 5: resourcetype
     */
    int valuetype = -1;
    
    int r;
    while((r = xmlTextReaderRead(reader)) == 1) {
        int nodetype = xmlTextReaderNodeType(reader);
        
        if(nodetype == XML_READER_TYPE_END_ELEMENT) {
            const xmlChar *name = xmlTextReaderConstLocalName(reader);
            if(!xmlStrcmp(name, BAD_CAST "response")) {
                break;
            }
        }
        
        switch(nodetype) {
            case XML_READER_TYPE_ELEMENT: {
                const xmlChar *name = xmlTextReaderConstLocalName(reader);
                if(!xmlStrcmp(name, BAD_CAST "href")) {
                    valuetype = 0;
                } else if(!xmlStrcmp(name, BAD_CAST "creationdate")) {
                    valuetype = 1;
                } else if(!xmlStrcmp(name, BAD_CAST "getlastmodified")) {
                    valuetype = 2;
                } else if(!xmlStrcmp(name, BAD_CAST "getcontentlength")) {
                    valuetype = 3;
                } else if(!xmlStrcmp(name, BAD_CAST "getcontenttype")) {
                    valuetype = 4;
                } else if(!xmlStrcmp(name, BAD_CAST "resourcetype")) {
                    valuetype = 5;
                } else if(!xmlStrcmp(name, BAD_CAST "collection") 
                        && valuetype == 5) {
                    res->collection = 1;
                } else {
                    valuetype = -1;
                }
                break;
            }
            case XML_READER_TYPE_TEXT: {
                const xmlChar *cvalue = xmlTextReaderConstValue(reader);
                if(cvalue == NULL) {
                    break;
                }
                char *value = strdup((char*)cvalue);
                switch(valuetype) {
                    case 0: {
                        res->href = value;
                        res->name = util_resource_name(value);
                        break;
                    }
                    case 1: {
                        res->creationdate = 0; // TODO
                        break;
                    }
                    case 2: {
                        res->lastmodified = 0; // TODO
                        break;
                    }
                    case 3: {
                        res->contentlength = atoi(value);
                        break;
                    }
                    case 4: {
                        res->contenttype = value;
                        //break;
                    }
                }
                //break;
            }
        }
    }
    
    if(!strcmp(res->href, propfind->url)) {
        propfind->resource = res;
    } else {
        propfind->children = ucx_dlist_append(propfind->children, res);
    }
    
    return 0;
}