Add bpod support

1 files changed, 203 insertions, 0 deletions

diff --git a/cmd/cetus/bpod.go b/cmd/cetus/bpod.go
new file mode 100644
index 0000000..d26e292
--- /dev/null
+++ b/cmd/cetus/bpod.go
@@ -0,0 +1,203 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"time"
+
+	"tildegit.org/andinus/cetus/background"
+	"tildegit.org/andinus/cetus/bpod"
+	"tildegit.org/andinus/cetus/cache"
+	"tildegit.org/andinus/cetus/notification"
+)
+
+func execBPOD() {
+	bpodApi := getEnv("BPOD_API", "https://www.bing.com/HPImageArchive.aspx")
+
+	// reqInfo holds all the parameters that needs to be sent with
+	// the request. GetJson() will pack apiKey & date in params
+	// map before sending it to another function. Adding params
+	// here will not change the behaviour of the function, changes
+	// have to be made in GetJson() too.
+	reqInfo = make(map[string]string)
+	reqInfo["api"] = bpodApi
+
+	if random {
+		reqInfo["random"] = "true"
+	}
+
+	cacheDir := fmt.Sprintf("%s/%s", cache.GetDir(), "bpod")
+	os.MkdirAll(cacheDir, os.ModePerm)
+
+	// Check if the file is available locally, if it is then don't
+	// download it again and get it from disk
+	//
+	// We don't know the bpod date because that will be there in
+	// response & we can't read the response without requesting
+	// it. So this will assume the bpod date to be today's date if
+	// *bpodRand is not set true. If *bpodRand is set true then we
+	// can't assume the date. Also this way too it can cause error
+	// if our assumed date doesn't matches date at the server.
+
+	if !random {
+		// If not random and the file exists then read from
+		// disk, if the file doesn't exist then get it and
+		// save it to disk.
+		file = fmt.Sprintf("%s/%s.json", cacheDir, time.Now().UTC().Format("2006-01-02"))
+		if _, err := os.Stat(file); err == nil {
+			data, err := ioutil.ReadFile(file)
+			// Not being able to read from the cache file
+			// is a small error and the program shouldn't
+			// exit but should continue after printing the
+			// log so that the user can investigate it
+			// later.
+			if err != nil {
+				err = fmt.Errorf("%s%s\n%s",
+					"bpod.go: failed to read file to data: ", file,
+					err.Error())
+				log.Println(err)
+				dlAndCacheBPODBody()
+			}
+			body = string(data)
+
+		} else if os.IsNotExist(err) {
+			dlAndCacheBPODBody()
+
+		} else {
+			// If file existed then that is handled by the
+			// if block, if it didn't exist then that is
+			// handled by the else if block. If we reach
+			// here then that means it's Schrödinger's
+			// file & something else went wrong.
+			log.Fatal(err)
+		}
+	} else {
+		// If random then get the file and save it to disk
+		// after unmarshal because we don't know the file name
+		// yet
+		body, err = bpod.GetJson(reqInfo)
+		if err != nil {
+			err = fmt.Errorf("%s\n%s",
+				"bpod.go: failed to get json response from api",
+				err.Error())
+			log.Fatal(err)
+		}
+
+	}
+	// Unmarshal before dump because otherwise if we come across
+	// the date for the first time then it would just dump and
+	// exit without saving it to cache. This way we first save it
+	// to cache if *bpodRand is true.
+	res, err := bpod.UnmarshalJson(body)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Correct format
+	res.URL = fmt.Sprintf("%s%s", "https://www.bing.com", res.URL)
+	dt, err := time.Parse("20060102", res.StartDate)
+	if err != nil {
+		log.Fatal(err)
+	}
+	res.StartDate = dt.Format("2006-01-02")
+
+	file = fmt.Sprintf("%s/%s.json", cacheDir, res.StartDate)
+	if random {
+		// Write body to the cache so that it can be read
+		// later.
+		err = ioutil.WriteFile(file, []byte(body), 0644)
+
+		// Not being able to write to the cache file is a
+		// small error and the program shouldn't exit but
+		// should continue after printing the log so that the
+		// user can investigate it later.
+		if err != nil {
+			err = fmt.Errorf("%s\n%s",
+				"bpod.go: failed to write body to file: ", file,
+				err.Error())
+			log.Println(err)
+		}
+	}
+
+	if dump {
+		fmt.Printf(body)
+	}
+
+	// Send a desktop notification if notify flag was passed.
+	if notify {
+		n := notification.Notif{}
+		n.Title = res.Title
+		n.Message = fmt.Sprintf("%s\n\n%s",
+			res.StartDate,
+			res.Copyright)
+
+		err = n.Notify()
+		if err != nil {
+			log.Println(err)
+		}
+	}
+
+	if print {
+		fmt.Printf("Title: %s\n\n", res.Title)
+		fmt.Printf("Copyright: %s\n", res.Copyright)
+		fmt.Printf("Copyright Link: %s\n", res.CopyrightLink)
+		fmt.Printf("Date: %s\n\n", res.StartDate)
+		fmt.Printf("URL: %s\n", res.URL)
+	}
+
+	// Proceed only if the command was set because if it was fetch
+	// then it's already finished & should exit now.
+	if os.Args[1] == "fetch" {
+		os.Exit(0)
+	}
+
+	// Try to set background only if the media type is an image.
+	// First it downloads the image to the cache directory and
+	// then tries to set it with feh. If the download fails then
+	// it exits with a non-zero exit code.
+	imgFile := fmt.Sprintf("%s/%s", cacheDir, res.Title)
+
+	// Check if the file is available locally, if it is then don't
+	// download it again and set it from disk
+	if _, err := os.Stat(imgFile); os.IsNotExist(err) {
+		err = background.Download(imgFile, res.URL)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+	} else {
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	err = background.SetFromFile(imgFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func dlAndCacheBPODBody() {
+	body, err = bpod.GetJson(reqInfo)
+	if err != nil {
+		err = fmt.Errorf("%s\n%s",
+			"bpod.go: failed to get json response from api",
+			err.Error())
+		log.Fatal(err)
+	}
+
+	// Write body to the cache so that it can be read later.
+	err = ioutil.WriteFile(file, []byte(body), 0644)
+
+	// Not being able to write to the cache file is a small error
+	// and the program shouldn't exit but should continue after
+	// printing the log so that the user can investigate it later.
+	if err != nil {
+		err = fmt.Errorf("%s\n%s",
+			"bpod.go: failed to write body to file: ", file,
+			err.Error())
+		log.Println(err)
+	}
+}