client/lua: wrap tags with error handler
This commit is contained in:
Ben Klein
parent
372b40a6b5
commit
6e07c61d3f
1 changed files with 76 additions and 69 deletions
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@ -41,81 +41,88 @@ end
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add_meta_tag("og:site_name", server_info.config.name)
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add_meta_tag("og:url", ngx.var.external_host_url .. ngx.var.request_uri_path)
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if ngx.var.request_uri_path:match('^/$') then -- Site root
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add_meta_tag("og:type", "website")
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add_meta_tag("og:title", server_info.config.name)
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add_meta_tag("twitter:title", server_info.config.name)
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-- if there's a featured post, let's use that as the image
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if server_info.featuredPost then
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local post_info = server_info.featuredPost
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-- NOTE this is different from the normal Post tags,
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-- notably we avoid setting the article type, author, time, etc
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local og_media_prefix
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if post_info.type == "image" then
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og_media_prefix = "og:image"
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add_meta_tag("twitter:card", "summary_large_image")
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add_meta_tag("twitter:image", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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elseif post_info.type == "video" then
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og_media_prefix = "og:video"
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-- some sites don't preview video, so at least provide a thumbnail
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. post_info.thumbnailUrl)
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local function generate_meta_tags ()
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if ngx.var.request_uri_path:match('^/$') then -- Site root
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add_meta_tag("og:type", "website")
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add_meta_tag("og:title", server_info.config.name)
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add_meta_tag("twitter:title", server_info.config.name)
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-- if there's a featured post, let's use that as the image
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if server_info.featuredPost then
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local post_info = server_info.featuredPost
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-- NOTE this is different from the normal Post tags,
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-- notably we avoid setting the article type, author, time, etc
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local og_media_prefix
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if post_info.type == "image" then
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og_media_prefix = "og:image"
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add_meta_tag("twitter:card", "summary_large_image")
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add_meta_tag("twitter:image", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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elseif post_info.type == "video" then
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og_media_prefix = "og:video"
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-- some sites don't preview video, so at least provide a thumbnail
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. post_info.thumbnailUrl)
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end
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add_meta_tag(og_media_prefix..":url", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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add_meta_tag(og_media_prefix..":width", post_info.canvasWidth)
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add_meta_tag(og_media_prefix..":height", post_info.canvasHeight)
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end
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add_meta_tag(og_media_prefix..":url", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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add_meta_tag(og_media_prefix..":width", post_info.canvasWidth)
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add_meta_tag(og_media_prefix..":height", post_info.canvasHeight)
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end
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elseif ngx.var.request_uri_path:match('^/post/([0-9]+)/?$') then -- Post metadata
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-- check if posts are accessible to anonymous users:
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if server_info.config.privileges["posts:view"] == "anonymous" then
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add_meta_tag("og:type", "article")
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local post_info = cjson.decode((ngx.location.capture("/_internal_api"..ngx.var.request_uri_path)).body)
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add_meta_tag("og:title", server_info.config.name .. " - Post " .. post_info.id)
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add_meta_tag("twitter:title", server_info.config.name .. " - Post " .. post_info.id)
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add_meta_tag("article:published_time", post_info.creationTime)
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local og_media_prefix
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if post_info.type == "image" then
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og_media_prefix = "og:image"
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add_meta_tag("twitter:card", "summary_large_image")
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add_meta_tag("twitter:image", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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elseif post_info.type == "video" then
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og_media_prefix = "og:video"
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add_meta_tag("twitter:card", "player")
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add_meta_tag("twitter:player:width", post_info.canvasWidth)
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add_meta_tag("twitter:player:height", post_info.canvasHeight)
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-- some sites don't preview video, so at least provide a thumbnail
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. post_info.thumbnailUrl)
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end
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add_meta_tag(og_media_prefix..":url", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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add_meta_tag(og_media_prefix..":width", post_info.canvasWidth)
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add_meta_tag(og_media_prefix..":height", post_info.canvasHeight)
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-- user is not present for anonymous uploads:
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if post_info.user then
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add_meta_tag("article:author", post_info.user.name)
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end
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else
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-- no permission to retrieve post data
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add_meta_tag("og:title", server_info.config.name .. " - Login required")
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end
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elseif ngx.var.request_uri_path:match('^/user/([^/]+)/?$') then -- User metadata
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local username = ngx.var.request_uri_path:match('^/user/([^/]+)/?$')
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add_meta_tag("og:title", server_info.config.name .. " - " .. username)
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add_meta_tag("og:type", "profile")
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-- check for permission to access user profiles
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if server_info.config.privileges["users:view"] == "anonymous" then
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local user_info = cjson.decode((ngx.location.capture("/_internal_api/user/"..username)).body)
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add_meta_tag("profile:username", user_info.name)
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local avatar_url
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avatar_url = user_info.avatarUrl
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if avatar_url:match("^https?://") then
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add_meta_tag("og:image", avatar_url)
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elseif ngx.var.request_uri_path:match('^/post/([0-9]+)/?$') then -- Post metadata
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-- check if posts are accessible to anonymous users:
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if server_info.config.privileges["posts:view"] == "anonymous" then
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add_meta_tag("og:type", "article")
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local post_info = cjson.decode((ngx.location.capture("/_internal_api"..ngx.var.request_uri_path)).body)
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add_meta_tag("og:title", server_info.config.name .. " - Post " .. post_info.id)
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add_meta_tag("twitter:title", server_info.config.name .. " - Post " .. post_info.id)
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add_meta_tag("article:published_time", post_info.creationTime)
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local og_media_prefix
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if post_info.type == "video" then
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og_media_prefix = "og:video"
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add_meta_tag("twitter:card", "player")
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add_meta_tag("twitter:player:width", post_info.canvasWidth)
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add_meta_tag("twitter:player:height", post_info.canvasHeight)
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-- some sites don't preview video, so at least provide a thumbnail
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. post_info.thumbnailUrl)
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else
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og_media_prefix = "og:image"
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add_meta_tag("twitter:card", "summary_large_image")
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add_meta_tag("twitter:image", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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end
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add_meta_tag(og_media_prefix..":url", ngx.var.external_host_url .. '/' .. post_info.contentUrl)
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add_meta_tag(og_media_prefix..":width", post_info.canvasWidth)
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add_meta_tag(og_media_prefix..":height", post_info.canvasHeight)
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-- user is not present for anonymous uploads:
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if post_info.user then
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add_meta_tag("article:author", post_info.user.name)
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end
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else
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. avatar_url)
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-- no permission to retrieve post data
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add_meta_tag("og:title", server_info.config.name .. " - Login required")
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end
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elseif ngx.var.request_uri_path:match('^/user/([^/]+)/?$') then -- User metadata
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local username = ngx.var.request_uri_path:match('^/user/([^/]+)/?$')
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add_meta_tag("og:title", server_info.config.name .. " - " .. username)
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add_meta_tag("og:type", "profile")
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-- check for permission to access user profiles
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if server_info.config.privileges["users:view"] == "anonymous" then
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local user_info = cjson.decode((ngx.location.capture("/_internal_api/user/"..username)).body)
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add_meta_tag("profile:username", user_info.name)
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local avatar_url
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avatar_url = user_info.avatarUrl
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if avatar_url:match("^https?://") then
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add_meta_tag("og:image", avatar_url)
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else
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add_meta_tag("og:image", ngx.var.external_host_url .. '/' .. avatar_url)
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end
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else
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-- no permission to view user data
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end
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else
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-- no permission to view user data
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end
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end
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local status, err = pcall(generate_meta_tags)
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if not status then
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ngx.log(ngx.STDERR, "Failed to generate meta tags: "..tostring(err))
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end
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-- Once tags have been generated, write them and then finish the response
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ngx.print(additional_tags)
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ngx.print(after_content)
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