Get all images from a board from a Pinterest web address

Okay, so I think this may be (with a few alterations) what you need.

Caveats:

1. This is PHP, not C# (but you said you were interested in any server-side language).
2. This code hooks into (unofficial) Pinterest search endpoints. You'll need to change $data and $search_res to reflect the appropriate endpoints (eg. BoardFeedResouce) for your tasks. Note: at least for search, Pinterest currently uses two endpoints, one for the initial page load, and another for the infinite scroll actions. Each has their own expected param structure.
3. Pinterest has no official public API, expect this to break whenever they change anything, and without warning.
4. You may find pinterestapi.co.uk easier to implement and acceptable for what you're doing.
5. I have some demo/debug code beneath the class that shouldn't be there once you're getting the data you want, and a default page fetch limit that you may want to change.

Points of interest:

1. The underscore _ parameter takes a timestamp in JavaScript format, ie. like Unix time but it has milliseconds added. It's not actually used for pagination.
2. Pagination uses the bookmarks property, so you make the first request to the 'new' endpoint which doesn't require it, and then take the bookmarks from the result and use it in your request to get the next 'page' of results, take the bookmarks from those results to fetch the next page after that, and so on until you run out of results or reach your pre-set limit (or you hit the server max for script execution time). I'd be curious to know exactly what the bookmarks field encodes. I would like to think there's some fun secret sauce beyond just a pin ID or some other page marker.
3. I'm skipping the html, instead dealing with JSON, as it's easier (for me) than using a DOM manipulation solution, or a bunch of regex.

<?phpif(!class_exists('Skrivener_Pins')) {  class Skrivener_Pins {    /**     * Constructor     */    public function __construct() {    }    /**     * Pinterest search function. Uses Pinterest's "internal" page APIs, so likely to break if they change.     * @author [@skrivener] Philip Tillsley     * @param $search_str     The string used to search for matching pins.     * @param $limit          Max number of pages to get, defaults to 2 to avoid excessively large queries. Use care when passing in a value.     * @param $bookmarks_str  Used internally for recursive fetches.     * @param $pages          Used internally to limit recursion.     * @return array()        int['id'], obj['image'], str['pin_link'], str['orig_link'], bool['video_flag']     *      * TODO:        *         *      */    public function get_tagged_pins($search_str, $limit = 1, $bookmarks_str = null, $page = 1) {      // limit depth of recursion, ie. number of pages of 25 returned, otherwise we can hang on huge queries      if( $page > $limit ) return false;      // are we getting a next page of pins or not      $next_page = false;      if( isset($bookmarks_str) ) $next_page = true;      // build url components      if( !$next_page ) {        // 1st time        $search_res = 'BaseSearchResource'; // end point        $path = '&module_path=' . urlencode('SearchInfoBar(query=' . $search_str . ', scope=boards)');        $data = preg_replace("'[\n\r\s\t]'","",'{          "options":{            "scope":"pins",            "show_scope_selector":true,            "query":"' . $search_str . '"          },          "context":{            "app_version":"2f83a7e"          },          "module":{            "name":"SearchPage",            "options":{              "scope":"pins",              "query":"' . $search_str . '"            }          },          "append":false,          "error_strategy":0          }');      } else {        // this is a fetch for 'scrolling', what changes is the bookmarks reference,         // so pass the previous bookmarks value to this function and it is included        // in query        $search_res = 'SearchResource'; // different end point from 1st time search        $path = '';        $data = preg_replace("'[\n\r\s\t]'","",'{          "options":{            "query":"' . $search_str . '",            "bookmarks":["' . $bookmarks_str . '"],            "show_scope_selector":null,            "scope":"pins"          },          "context":{            "app_version":"2f83a7e"          },            "module":{              "name":"GridItems",            "options":{              "scrollable":true,              "show_grid_footer":true,              "centered":true,              "reflow_all":true,              "virtualize":true,              "item_options":{                "show_pinner":true,                "show_pinned_from":false,                "show_board":true              },              "layout":"variable_height"            }          },          "append":true,          "error_strategy":2        }');      }      $data = urlencode($data);      $timestamp = time() * 1000; // unix time but in JS format (ie. has ms vs normal server time in secs), * 1000 to add ms (ie. 0ms)      // build url      $url = 'http://pinterest.com/resource/' . $search_res . '/get/?source_url=/search/pins/?q=' . $search_str          . '&data=' . $data          . $path          . '&_=' . $timestamp;//'1378150472669';      // setup curl      $ch = curl_init();      curl_setopt($ch, CURLOPT_URL, $url);      curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);      curl_setopt($ch, CURLOPT_HTTPHEADER, array("X-Requested-With: XMLHttpRequest"));      // get result      $curl_result = curl_exec ($ch); // this echoes the output      $curl_result = json_decode($curl_result);      curl_close ($ch);      // clear html to make var_dumps easier to see when debugging      // $curl_result->module->html = '';      // isolate the pin data, different end points have different data structures      if(!$next_page) $pin_array = $curl_result->module->tree->children[1]->children[0]->children[0]->children;      else $pin_array = $curl_result->module->tree->children;      // map the pin data into desired format      $pin_data_array = array();      $bookmarks = null;      if(is_array($pin_array)) {        if(count($pin_array)) {          foreach ($pin_array as $pin) {            //setup data            $image_id = $pin->options->pin_id;            $image_data = ( isset($pin->data->images->originals) ) ? $pin->data->images->originals : $pin->data->images->orig;            $pin_url = 'http://pinterest.com/pin/' . $image_id . '/';            $original_url = $pin->data->link;            $video = $pin->data->is_video;            array_push($pin_data_array, array(              "id"          => $image_id,              "image"       => $image_data,              "pin_link"    => $pin_url,              "orig_link"   => $original_url,              "video_flag"  => $video,              ));          }          $bookmarks = reset($curl_result->module->tree->resource->options->bookmarks);        } else {          $pin_data_array = false;        }      }      // recurse until we're done      if( !($pin_data_array === false) && !is_null($bookmarks) ) {        // more pins to get        $more_pins = $this->get_tagged_pins($search_str, $limit, $bookmarks, ++$page);        if( !($more_pins === false) ) $pin_data_array = array_merge($pin_data_array, $more_pins);        return $pin_data_array;      }      // end of recursion      return false;    }  } // end class Skrivener_Pins} // end if/** * Debug/Demo Code * delete or comment this section for production */// output headers to control how the content displays// header("Content-Type: application/json");header("Content-Type: text/plain");// header("Content-Type: text/html");// define search term// $tag = "vader";$tag = "haemolytic";// $tag = "qjkjgjerbjjkrekhjk";if(class_exists('Skrivener_Pins')) {  // instantiate the class  $pin_handler = new Skrivener_Pins();  // get pins, pinterest returns 25 per batch, function pages through this recursively, pass in limit to   // override default limit on number of pages to retrieve, avoid high limits (eg. limit of 20 * 25 pins/page = 500 pins to pull   // and 20 separate calls to Pinterest)  $pins1 = $pin_handler->get_tagged_pins($tag, 2);  // display the pins for demo purposes  echo '<h1>Images on Pinterest mentioning "' . $tag . '"</h1>' . "\n";  if( $pins1 != false ) {    echo '<p><em>' . count($pins1) . ' images found.</em></p>' . "\n";    skrivener_dump_images($pins1, 5);  } else {    echo '<p><em>No images found.</em></p>' . "\n";  }}// demo function, dumps images in array to html img tags, can pass limit to only display part of arrayfunction skrivener_dump_images($pin_array, $limit = false) {  if(is_array($pin_array)) {    if($limit) $pin_array = array_slice($pin_array, -($limit));    foreach ($pin_array as $pin) {      echo '<img src="' . $pin['image']->url . '" width="' . $pin['image']->width . '" height="' . $pin['image']->height . '" >' . "\n";    }  }}?>

Let me know if you run into problems getting this adapted to your particular end points. Apols for any sloppiness in the code, it didn't make it to production originally.

Probably a bit late but, with py3-pinterest open source project you can do it easily:

First get all pins as objects from the board, they include the original image url also.

# get all pins for the boardboard_pins = []pin_batch = pinterest.board_feed(board_id=target_board['id'], board_url=target_board['url'])while len(pin_batch) > 0:    board_pins += pin_batch    pin_batch = pinterest.board_feed(board_id=target_board['id'], board_url=target_board['url'])

Then you can obtain the image urls and download them or do whatever you like with them

for pin in board_pins:    url = pin['image']    # process image url..

Full code example:https://github.com/bstoilov/py3-pinterest/blob/master/download_board_images.py

Yes its python but if you still insist on c# it should be easy to port it :)

A couple of people have suggested using javascript to emulate scrolling.

I don't think you need to emulate scrolling at all, I think you just need to find out the format of the URIs called via AJAX whenever scrolling occurs, and then you can get each "page" of results sequentially. A little backward engineering is required.

Using the network tab of Chrome inspector I can see that once I reach a certain distance down the page, this URI is called:

http://pinterest.com/resource/BoardFeedResource/get/?source_url=%2Fdodo%2Fweb-designui-and-mobile%2F&data=%7B%22options%22%3A%7B%22board_id%22%3A%22158400180582875562%22%2C%22access%22%3A%5B%5D%2C%22bookmarks%22%3A%5B%22LT4xNTg0MDAxMTE4NjcxMTM2ODk6MjV8ZWJjODJjOWI4NTQ4NjU4ZDMyNzhmN2U3MGQyZGJhYTJhZjY2ODUzNTI4YTZhY2NlNmY0M2I1ODYwYjExZmQ3Yw%3D%3D%22%5D%7D%2C%22context%22%3A%7B%22app_version%22%3A%22fb43cdb%22%7D%2C%22module%22%3A%7B%22name%22%3A%22GridItems%22%2C%22options%22%3A%7B%22scrollable%22%3Atrue%2C%22show_grid_footer%22%3Atrue%2C%22centered%22%3Atrue%2C%22reflow_all%22%3Atrue%2C%22virtualize%22%3Atrue%2C%22item_options%22%3A%7B%22show_rich_title%22%3Afalse%2C%22squish_giraffe_pins%22%3Afalse%2C%22show_board%22%3Afalse%2C%22show_via%22%3Afalse%2C%22show_pinner%22%3Afalse%2C%22show_pinned_from%22%3Atrue%7D%2C%22layout%22%3A%22variable_height%22%7D%7D%2C%22append%22%3Atrue%2C%22error_strategy%22%3A1%7D&_=1377092055381

if we decode that, we see that it's mostly JSON

http://pinterest.com/resource/BoardFeedResource/get/?source_url=/dodo/web-designui-and-mobile/&data={"options": {    "board_id": "158400180582875562",    "access": [],    "bookmarks": [        "LT4xNTg0MDAxMTE4NjcxMTM2ODk6MjV8ZWJjODJjOWI4NTQ4NjU4ZDMyNzhmN2U3MGQyZGJhYTJhZjY2ODUzNTI4YTZhY2NlNmY0M2I1ODYwYjExZmQ3Yw=="    ]},"context": {    "app_version": "fb43cdb"},"module": {    "name": "GridItems",    "options": {        "scrollable": true,        "show_grid_footer": true,        "centered": true,        "reflow_all": true,        "virtualize": true,        "item_options": {            "show_rich_title": false,            "squish_giraffe_pins": false,            "show_board": false,            "show_via": false,            "show_pinner": false,            "show_pinned_from": true        },        "layout": "variable_height"    }},"append": true,"error_strategy": 1}&_=1377091719636

Scroll down until we get a second request, and we see this

http://pinterest.com/resource/BoardFeedResource/get/?source_url=/dodo/web-designui-and-mobile/&data={    "options": {        "board_id": "158400180582875562",        "access": [],        "bookmarks": [            "LT4xNTg0MDAxMTE4NjcwNTk1ODQ6NDl8ODFlMDUwYzVlYWQxNzVmYzdkMzI0YTJiOWJkYzUwOWFhZGFkM2M1MzhiNzA0ZDliZDIzYzE3NjkzNTg1ZTEyOQ=="        ]    },    "context": {        "app_version": "fb43cdb"    },    "module": {        "name": "GridItems",        "options": {            "scrollable": true,            "show_grid_footer": true,            "centered": true,            "reflow_all": true,            "virtualize": true,            "item_options": {                "show_rich_title": false,                "squish_giraffe_pins": false,                "show_board": false,                "show_via": false,                "show_pinner": false,                "show_pinned_from": true            },            "layout": "variable_height"        }    },    "append": true,    "error_strategy": 2}&_=1377092231234

As you can see, not much has changed. The Board_id is the same. error_strategy is now 2, and the &_ at the end is different.

The &_ parameter is key here. I would bet that it tells the page where to begin the next set of photos. I can't find a reference to it in either of the responses or the original Page HTML but it has to be in there somewhere, or be generated by javascript on the client side. Either way, the page / browser has to know what to ask for next, so this information is something you should be able to get at.