http.cpp

// name: http.cpp
// version: 1.2
// description: handles the http protocol

// libraries
#include <iostream>
#include <string.h>
#include "netsock.h"

// namespaces
using namespace std;

// http handler header
#include "http.h"

// constructors
http::http() { /* do nothing */ }

// grabs data from a web page
const char *http::get(const char *hostname, const char *location) {

    // declare variables
    netsock socket;
    string hget, host;

    // clear strings
    hget.empty();
    host.empty();

    // build get header
    hget = "GET ";
    hget += location;
    hget += " HTTP/1.0\r\n";

    // build host header
    host = "Host: ";
    host += hostname;
    host += "\r\n";

    // clear socket
    socket.disconnect();

    // make connection
    socket.connect(hostname, 80);

    // send get header
    socket.send(hget.c_str());

    // send host header
    socket.send(host.c_str());

    // send user agent header
    socket.send("User-Agent: Versidyne/1.0\r\n");

    // send end of line
    socket.send("\r\n");

    // return data
    return clean(socket.receive());

}

// grabs usable data from raw data
const char *http::clean(const char *data) {

    // declare variables
    int i, e, o, x;

    // set integers
    e = strlen(data);
    x = 0;

    // create local variable
    char temp[e];

    // scroll through data
    for (i = 0; i < e; i++) {
        // find last character of header
        if (data[i] == '\n' && data[i - 1] == '\r' && data[i - 2] == '\n' && data[i - 3] == '\r') {
            // scroll through data starting with marker
            for (o = i + 1; o < e; o++) {
                // set beginning of array at beginning of data
                temp[x] = data[o];
                // increment pointer integer
                x++;
            }
            // find final character and set to null byte
            if (temp[x - 1] == '\n') {
                if (temp[x - 2] == '\r') { temp[x - 2] = '\0'; }
                else { temp[x - 1] = '\0'; }
            }
            else { temp[x] = '\0'; }
            // exit scroll
            break;
        }
    }

    // return condition
    return temp;

}

// grabs internal header data
const char *http::head(const char *data) {

    // declare variables
    int i, e, o, x;

    // set integers
    e = strlen(data);
    x = 0;

    // create local variable
    char temp[e];

    // scroll through data
    for (i = 0; i < e; i++) {
        // find first instance of head tag
        if (data[i] == '>' && data[i - 1] == 'd' && data[i - 2] == 'a' && data[i - 3] == 'e' && data[i - 4] == 'h' &&
            data[i - 5] == '<') {
            // scroll through data starting with marker
            for (o = i + 1; o < e; o++) {
                // detect closing head tag, set pointer, and stop scroll
                if (data[o] == '>' && data[o - 1] == 'd' && data[o - 2] == 'a' && data[o - 3] == 'e' &&
                    data[o - 4] == 'h' && data[o - 5] == '/' && data[o - 6] == '<') {
                    x -= 6;
                    break;
                }
                    // set current array cell and increment
                else { temp[x++] = data[o]; }
            }
            // find final character and set to null byte
            if (temp[x - 1] == '\n') {
                if (temp[x - 2] == '\r') { temp[x - 2] = '\0'; }
                else { temp[x - 1] = '\0'; }
            }
            else { temp[x] = '\0'; }
            // exit loop
            break;
        }
    }

    // return condition
    return temp;

}

// grabs internal body data
const char *http::body(const char *data) {

    // declare variables
    int i, e, o, x;

    // set integers
    e = strlen(data);
    x = 0;

    // create local variable
    char temp[e];

    // scroll through data
    for (i = 0; i < e; i++) {
        // find first instance of head tag
        if (data[i] == '>' && data[i - 1] == 'y' && data[i - 2] == 'd' && data[i - 3] == 'o' && data[i - 4] == 'b' &&
            data[i - 5] == '<') {
            // scroll through data starting with marker
            for (o = i + 1; o < e; o++) {
                // detect closing head tag, set pointer, and stop scroll
                if (data[o] == '>' && data[o - 1] == 'y' && data[o - 2] == 'd' && data[o - 3] == 'o' &&
                    data[o - 4] == 'b' && data[o - 5] == '/' && data[o - 6] == '<') {
                    x -= 6;
                    break;
                }
                    // set current array cell and increment
                else { temp[x++] = data[o]; }
            }
            // find final character and set to null byte
            if (temp[x - 1] == '\n') {
                if (temp[x - 2] == '\r') { temp[x - 2] = '\0'; }
                else { temp[x - 1] = '\0'; }
            }
            else { temp[x] = '\0'; }
            // exit loop
            break;
        }
    }

    // return condition
    return temp;

}

// grabs all link data
const char *http::links(const char *data) {

    // declare variables
    int e, i, l, o, t;

    // set length
    e = strlen(data);
    t = 0;

    // create local variables
    char temp[e];
    char link[e];

    // scroll through data
    for (i = 0; i < e; i++) {
        // find first instance of head tag
        if (data[i] == '<' && data[i + 1] == 'a' && data[i + 2] == ' ' && data[i + 3] == 'h' && data[i + 4] == 'r' &&
            data[i + 5] == 'e' && data[i + 6] == 'f' && data[i + 7] == '=') {
            //if (data[i] == '=' && data[i-1] == 'f' && data[i-2] == 'e' && data[i-3] == 'r' && data[i-4] == 'h' && data[i-5] == ' ' && data[i-6] == 'a' && data[i-7] == '<') {
            // set beginning
            l = 0;
            // scroll through data starting with marker
            for (o = i + 8; o < e; o++) {
                // detect closing link tag, set pointer, and stop scroll
                if (data[o] == '>') { break; }
                    // set current array cell and increment
                else { link[l++] = data[o]; }
            }
            // find final character and set to null byte
            if (link[l - 1] == '\n') {
                if (link[l - 2] == '\r') { link[l - 2] = '\0'; }
                else { link[l - 1] = '\0'; }
            }
            else { link[l] = '\0'; }
            // scroll through extracted data
            for (o = 0; o < e - 8; o++) {
                if (link[o] == 'h' && link[o + 1] == 't' && link[o + 2] == 't' && link[o + 3] == 'p') {
                    if (link[o + 4] == ':' && link[o + 5] == '/' && link[o + 6] == '/') {
                        for (l = o; l < e; l++) { if (link[l] == '\0') { break; } else { link[l] = link[l + 7]; }}
                    }
                    else if (link[o + 4] == 's' && link[o + 5] == ':' && link[o + 6] == '/' && link[o + 7] == '/') {
                        for (l = o; l < e; l++) { if (link[l] == '\0') { break; } else { link[l] = link[l + 8]; }}
                    }
                    //o = l;
                    //break;
                }
                else if (link[o] == 'w' && link[o + 1] == 'w' && link[o + 2] == 'w' &&
                         link[o + 3] == '.') { /* do nothing */ }
                else { /* do nothing */ }
            }
            // find final character and set to null byte
            if (link[o - 1] == '\n') {
                if (link[o - 2] == '\r') { link[o - 2] = '\0'; }
                else { link[o - 1] = '\0'; }
            }
            else { link[o] = '\0'; }
            // scroll through final data and append to temp
            for (o = 0; o < e; o++) {
                if (link[o] == '\0') {
                    temp[t++] = ' ';
                    temp[t] = '\0';
                    break;
                }
                else { temp[t++] = link[o]; }
            }
        }
    }

    // return condition
    return temp;

}