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client/lua: additional post tags

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This commit is contained in:
Ben Klein 2021-07-10 16:45:21 -04:00
parent 9fdeb293c1
commit 9f1bb53b4f
1 changed files with 13 additions and 1 deletions
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14
client/metatags.lua
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@ -33,27 +33,39 @@ local server_info = cjson.decode(server_info_resp.body)
local additional_tags = ""
local function add_meta_tag (property, content)
-- NOTE do not allow user-provided data in the property name, only the content has quotes escaped
additional_tags = additional_tags .. "<meta property=\"" .. property .. "\" content=\"" .. tostring(content):gsub('"', '\\"') .. "\"/>"
end
-- Add the site name tag
add_meta_tag("og:site_name", server_info.config.name)
add_meta_tag("og:url", ngx.var.external_host_url .. ngx.var.request_uri)
add_meta_tag("og:url", ngx.var.external_host_url .. ngx.var.request_uri_path)
if ngx.var.request_uri_path:match('^/post') then -- Post metadata
-- check if posts are accessible to anonymous users:
if server_info.config.privileges["posts:view"] == "anonymous" then
add_meta_tag("og:type", "article")
local post_info = cjson.decode((ngx.location.capture("/_internal_api"..ngx.var.request_uri_path)).body)
add_meta_tag("og:title", server_info.config.name .. " - Post " .. post_info.id)
add_meta_tag("twitter:title", server_info.config.name .. " - Post " .. post_info.id)
add_meta_tag("article:published_time", post_info.creationTime)
local og_media_prefix
if post_info.type == "image" then
og_media_prefix = "og:image"
add_meta_tag("twitter:card", "summary_large_image")
add_meta_tag("twitter:image", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
elseif post_info.type == "video" then
og_media_prefix = "og:video"
-- some sites don't preview video, so at least provide a thumbnail
add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. post_info.thumbnailUrl)
end
add_meta_tag(og_media_prefix..":url", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
add_meta_tag(og_media_prefix..":width", post_info.canvasWidth)
add_meta_tag(og_media_prefix..":height", post_info.canvasHeight)
-- user is not present for anonymous uploads:
if post_info.user then
add_meta_tag("article:author", post_info.user.name)
end
else
-- no permission to retrieve post data
add_meta_tag("og:title", server_info.config.name .. " - Login required")