/// <summary>
/// Gets the search result from wikipedia.
/// </summary>
/// <param name="messagingExtensionActivityAction">The messaging extension activity action.</param>
/// <returns>Messaging extension result.</returns>
public async Task <MessagingExtensionResult> GetSearchResultAsync(MessagingExtensionActivityAction messagingExtensionActivityAction)
{
MessagingExtensionResult composeExtensionResult = new MessagingExtensionResult
{
Type = "result",
AttachmentLayout = "list",
Attachments = new List <MessagingExtensionAttachment>(),
};
IList <WikipediaResult> searchResults = new List <WikipediaResult>();
// Search Wikipedia
string apiUrl = GenerateSearchApiUrl(messagingExtensionActivityAction.MessagingExtensionQuery);
WikipediaQueryResult queryResult = await this.InvokeWikipediaApiAsync(apiUrl).ConfigureAwait(false);
searchResults = queryResult.Query.Results;
// Grab pageIds so that we can batch query to fetch image urls of the pages
IList <string> pageIds = new List <string>();
foreach (WikipediaResult searchResult in searchResults)
{
pageIds.Add(searchResult.Pageid);
}
IDictionary <string, string> imageResults = await this.GetImageUrlAsync(pageIds).ConfigureAwait(false);
// Genereate results
foreach (WikipediaResult searchResult in searchResults)
{
string imageUrl = DefaultImageUrl; // Always set a default image url in case of failure, or image doesn't exist
if (imageResults.ContainsKey(searchResult.Pageid))
{
imageUrl = imageResults[searchResult.Pageid];
}
ThumbnailCard previewCard = new ThumbnailCard
{
Title = HttpUtility.HtmlEncode(searchResult.Title),
Text = searchResult.Snippet,
};
previewCard.Images = new CardImage[] { new CardImage(imageUrl, searchResult.Title) };
// Generate cards with links in the titles - preview cards don't have links
ThumbnailCard card = new ThumbnailCard
{
Title = "<a href='" +
HttpUtility.HtmlAttributeEncode("https://en.wikipedia.org/wiki/" +
Uri.EscapeDataString(searchResult.Title)) +
"' target='_blank'>" +
HttpUtility.HtmlEncode(searchResult.Title) +
"</a>",
Text = searchResult.Snippet,
Images = previewCard.Images,
};
composeExtensionResult.Attachments.Add(card.ToAttachment().ToMessagingExtensionAttachment(previewCard.ToAttachment()));
}
return(composeExtensionResult);
}
/// <summary>
/// Gets the image URL asynchronously.
/// </summary>
/// <param name="pageIds">The page ids.</param>
/// <returns>Image url map.</returns>
private async Task <IDictionary <string, string> > GetImageUrlAsync(IList <string> pageIds)
{
string pageIdQuery = string.Join("|", pageIds);
IDictionary <string, string> result = new Dictionary <string, string>();
WikipediaQueryResult queryResult = await this.InvokeWikipediaApiAsync(ImageSearchUrl + pageIdQuery).ConfigureAwait(false);
if (queryResult != null && queryResult.Query != null)
{
foreach (WikipediaPage page in queryResult.Query.Pages)
{
if (page.Thumbnail != null)
{
result.Add(page.Pageid, page.Thumbnail.Source);
}
}
}
return(result);
}
