144 lines
3.6 KiB
Go
144 lines
3.6 KiB
Go
/*
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* Scope - A simple and minimal metasearch engine
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* Copyright (C) 2021 Arsen Musayelyan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package cards
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import (
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"encoding/json"
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"fmt"
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"html/template"
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"net/http"
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"net/url"
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"time"
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)
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func init() {
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Register("ddg", 3, NewDDGCard)
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}
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// ddgAttribution is HTML for attribution of DuckDuckGo at their request
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const ddgAttribution = `<p class="is-size-7 pt-2">
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<span class="iconify" data-icon="simple-icons:duckduckgo" data-inline="true"></span>
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Results from
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<a href="https://duckduckgo.com/%s">DuckDuckGo »</a>
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</p>`
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// DDGCard represents a DuckDuckGo Instant Answer API card
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type DDGCard struct {
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query string
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userAgent string
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resp DDGInstAns
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}
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// DDGInstAns represents a DuckDuckGo Instant Answer API response
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type DDGInstAns struct {
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Abstract string
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AbstractText string
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AbstractSource string
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AbstractURL string
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Image string
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Heading string
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Answer string
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AnswerType string
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}
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// NewDDGCard is a NewCardFunc that creates a new DDGCard
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func NewDDGCard(query, userAgent string) Card {
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return &DDGCard{
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query: url.QueryEscape(query),
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userAgent: userAgent,
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}
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}
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// RunQuery requests the query from the instant answer API
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func (ddg *DDGCard) RunQuery() error {
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http.DefaultClient.Timeout = 5 * time.Second
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// Create new API request
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req, err := http.NewRequest(
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http.MethodGet,
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"https://api.duckduckgo.com/?q="+ddg.query+"&format=json",
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nil,
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)
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if err != nil {
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return err
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}
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req.Header.Set("User-Agent", ddg.userAgent)
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// Perform request
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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return err
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}
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// Decode response into response struct
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err = json.NewDecoder(res.Body).Decode(&ddg.resp)
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if err != nil {
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return err
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}
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return nil
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}
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// Returned checks if abstract is empty.
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// If it is, query returned no result.
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func (ddg *DDGCard) Returned() bool {
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// Value was returned if abstract is not empty
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return ddg.resp.Abstract != ""
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}
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// Matches always returns true as there are no keys
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func (ddg *DDGCard) Matches() bool {
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return true
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}
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// StripKey returns the query as there are no keys
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func (ddg *DDGCard) StripKey() string {
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// No key to strip, so return query
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return ddg.query
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}
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// Title returns the instant answer heading
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func (ddg *DDGCard) Title() string {
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return ddg.resp.Heading
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}
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// Content returns the instant answer abstract with
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// DuckDuckGo attibution
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func (ddg *DDGCard) Content() template.HTML {
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// Return abstract with attribution
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return template.HTML(ddg.resp.Abstract + fmt.Sprintf(ddgAttribution, ddg.query))
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}
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// Footer returns a footer containing URL and name of source
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// gotten from instant answer API
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func (ddg *DDGCard) Footer() template.HTML {
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// Return footer with abstract url and source
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return template.HTML(fmt.Sprintf(
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`<div class="card-footer"><a class="card-footer-item" href="%s">%s</a></div>`,
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ddg.resp.AbstractURL,
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ddg.resp.AbstractSource,
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))
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}
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// Head returns an empty string as no extra tags are reuired
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// for DDGCard
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func (ddg *DDGCard) Head() template.HTML {
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return ""
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}
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